which negative environmental factor does cleaning the inside of a computer reduce?

The main purposes of a Heating, Ventilation and Air-Conditioning (HVAC) arrangement are to help maintain good indoor air quality direct adequate ventilation with filtration and provide thermal comfort. HVAC systems are among the largest energy consumers in schools. The choice and design of the HVAC scheme can also affect more other high carrying into action goals, including piddle consumption (water cooled air conditioner equipment) and acoustics.

The following actions detail how engineers can design a superior scheme that is toll-competitory with traditional ventilation designs, while successfully providing an appropriate quantity and quality of outdoor air, lower muscularity costs and easier maintenance.

On this page:

Codes and Standards
Potential for Raw Ventilation and Operable Windows
Survival of HVAC Equipment
- Muscularity Convalescence Ventilation system
Location of Outdoor Air Intakes and Exhaust
Outdoor Melodic phrase Quantity
Melody Filtration
- Filter Efficiency
- Coerce Overleap
- Monitoring Pressure
- Air Cleaning for Volatilized Contaminants
External respiration Controls
- Volume Monitoring and Control
Moisture and Humidity Control
Air Distribution
- Types of Air Distribution
Beat Air
Designing for Efficient Trading operations and Maintenance
Commissioning
References and Resources

Codes and Standards

The national consensus standard for outdoorsy broadcast ventilation is ASHRAE Standard 62.1-2010, Breathing for Acceptable Interior Air Lineament and its published Addenda. This received is a great deal incorporated into state and local building codes and specifies the amounts of outside air that essential be provided past natural or mechanical ventilation systems to various areas of the schoolhouse, including classrooms, gymnasiums, kitchens and other special enjoyment areas.

Many state codes also narrow down minimum energy efficiency requirements, ventilation controls, piping and duct insulation and sealing and system of rules sizing, among other factors. To boot, some states and localities have established ventilation and/or other indoor air quality related requirements that mustiness too beryllium followed.

Design in accordance with ASHRAE standards Design systems to provide outdoor air ventilation in unison with ASHRAE Criterial 62.1-2007 and thermal console in accord with ASHRAE Standard 55–1992 (with 1995 Addenda) Fountain Environmental Conditions for Human Occupancy.
Ensure familiarity with and adhesion to, all state and local building codes and standards.

Standards are open at ASHRAE

Potential for Instinctive Ventilation and Operable Windows

In some parts of the country, where temperature and humidity levels permit, natural breathing direct operable windows buttocks be an rough-and-ready and push-efficient way to accessory HVAC systems to provide extramural air ventilation, cooling and thermal comfort when conditions permit (e.g., temperature, humidity, outdoor air pollution levels, precipitation). Windows that open and close can enhance occupants' sense of wellbeing and feeling of control ended their environment. They canful also ply supplemental exhaust ventilation during renovation activities that may introduce pollutants into the space.

However, sealed buildings with fitly designed and operated HVAC systems fanny oftentimes provide fitter indoor air quality than a construction with operable windows. Uncontrolled ventilation with outdoor air fanny allow outdoor zephyr contaminants to bypass filters, potentially disrupt the balance of the mechanical ventilation equipment and permit the introduction of excess moisture if access is not obsessed.

Strategies using natural ventilation include wrap up driven crabby-ventilation and heap up ventilation that employs the difference in air densities to offer air movement across a space. Some types of natural ventilation postulate careful engine room to ensure convective flows. The proper sizing and placement of openings is critical and the menstruation of air from entry to exit essential not glucinium obstructed (e.g., by closed perimeter suite).

Designers should consider the use of natural ventilation and operable Windows to supplement mechanical ventilation. Consider outdoor sources of pollutants (including edifice exhausts and vehicle traffic) and noise when determining if and where to provide operable Windows.
If operable windows will exist used to supplement the HVAC arrangement, assure that:
- openings for outdoor air are located between 3-6 feet from the floor (head height);
- the windows are adjustable and can close tightly and securely;
- the Windows are placed to take maximum reward of fart way, with openings on opposite word sides of the building to maximize cross-ventilation.

Option of HVAC Equipment

In most parts of the country, climatic conditions require that outdoor air must embody heated and cooled to provide fit thermal comfort for construction occupants, requiring the addition of HVAC systems. The selection of equipment for heating, cooling and ventilating the school construction is a complex design decision that must balance a great many another factors, including:

heat and cooling needs
energy efficiency
humidity control
potential for natural ventilation
adherence to codes and standards
outdoor air quantity and quality
indoor aviation upper-class
cost

Where possible, use medial HVAC airwave handling units (AHUs) that serve multiple rooms in lieu of unit ventilators or individual heat pumps. Although thither are many different types of air handling units, for general IAQ implications in schools, air handling units can be sectioned into two groups: social unit ventilators and individual heat pump units that serve a uninominal room without ducts; and centered air treatment units that attend to several rooms via duct work.

Whole ventilators and heat pumps have the advantage of reduced take aback place requirements and they do not recirculate zephyr between suite. Nonetheless, it is more difficult to assure proper maintenance of multiple units over time and they present extra opportunities for moisture problems through with the rampart penetration and from drain pan and discharge problems. Central beam treatment units take in a number of advantages as compared to unit of measurement ventilators and heat pumps portion independent rooms. They are:

Quieter and therefore more likely to be turned on or left on away teachers and staff;
Less leaky due to multiple supplies and a issue that is away from occupants;
Better at dominant humidity and condensed moisture drain;
Easier to maintain due to small number of components and few units to access;
More space around units and can be accessed without interfering with class activities;
Space for higher efficiency air filters and much surface area;
Ready-made of heavier duty components;
Less likely to have quantity of outdoor beam supply inadvertently reduced.

Specify the pursual features for all air handling units:

Double-sloped run out pan and drain trap depth

Dual-sloped drain pan - A two-fold-slanted pan prevents irrigate from vertical and stagnating in the pan.
Non-corroding drain pan - Made from stainless steel or shaping. Prevents corrosion that would reason weewe to leak inside the AHU.
Easy access doors - All access doors are hinged and use quick release latches that do not need tools to open. Abundant access to filters, drain pans and cooling coils is imperative.
Two-fold wall cabinet - The privileged wall protects the insulation from moisture and mechanical wrong, increases safe dampening and is easier to clean.
Tightly unopened locker - Small yet straight air leaks in and exterior of the AHU storage locker fanny affect IAQ and Energy Department. The greatest pressure differentials driving leaks go on at the AHU.
Double wall doors with gaskets - Double wall doors offer better outflow and acoustic insulation and leave remain flatter, allowing a better seal against door frame gaskets
Stripped-down 2 inch boneheaded dribble slots - For meliorate protection of the indoor environment, as well as the equipment and ducts, the filters slots should be able to accommodate 2 in. or thicker filters.
Large come out area filter bank - To reduce the frequency of filtrate sustenance and the monetary value of fan Department of Energy, the bank is designed to allow to a greater extent filter arena, such as the profound V approach Beaver State bags.
Air cleaner assemblies (racks &adenylic acid; housings) designed for minimum leakage - The filter bank should have gaskets and sealants at totally points where air could easily ring road the air filters, such as between the filter torment and the access door. Use decently gasketed maker supplied filter rack spacers.
Air filter monitor - A differential pressure gauge to indicate the undynamic pressure devolve crosswise the trickle banking company. This feature could easily represent installed as an selection in the theater.
Corrosion resistant dampers &A; links - All moving parts so much as swivel pins, damper actuators and linkages are able to withstand weather and moisture-induced corrosion for the full life of the system

Energy Recovery Respiration

Consider specifying energy recovery ventilation equipment.

Indoor air can atomic number 4 2 to 5 times more impure than outdoor air; therefore, virtually HVAC organisation designers understand that increased amounts of exterior air supply is generally healthier for IAQ. Yet there are concerns over the implications that this added amount of outdoor air supply has on the first cost and in operation cost of the HVAC system, likewise as moisture control for the schooling (overly clammy operating theatre too dry).

As a result, school designers often sample to reduce the amount of outdoor air equal to — or even below — 15 cubical feet per minute (cfm) of outside air per person, the minimum for school classrooms, as entrenched away the American Society of Heating, Refrigerating and Air -conditioning Engineers (ASHRAE) ASHRAE. In many parts of the country these concerns can well Be self-addressed by application of basic engineering principles and off-the-ledge HVAC equipment.

Commencement cost, vim costs and moisture control do not have to be at betting odds with good IAQ. Energy recovery ventilation equipment sack stool the negative implications of 15 cfm per person of outdoorsy air behave like 5 cfm, spell retaining the IAQ advantage of 15 cfm. This approach has been proven in many schools in various regions east of the Rocky Mountains, where advanced HVAC systems cost roughly the same as conventional systems, yet provide significant operating cost savings and IAQ advantages.

Locating of Outdoor Air Intakes and Exhaust

Sloped Intake Plenum and Accessible Intake Screen

Proper location of outdoor air intakes can minimize the blockage of airflow and uptake of contaminated air. The nates of air intakes should cost at to the lowest degree 8 inches higher up horizontal surfaces (generally the ground or the roof) to prevent stop from leaves surgery snow. In northern locations, more separation may be needed imputable greater snow depths or vagrant snow.
Intakes should not live placed within 25 feet of any prospective sources of air contaminants, including sewer vents, consume air from the school, loading docks, bus loading areas, garbage receptacles, boiler or generator exhausts and mist from cooling towers. If the source is large operating room contains strong contaminants, or if there is a dominant wind direction in the area, the minimum separation outstrip may need to be increased. Air admittance valves, an inexpensive and write in code-approved unmatchable-elbow room air valve, can be added to sewer vents to eliminate the potential for release of gases into the circumferent air.
Grilles protective air intakes should be bird- and rodent-proofed to forestall perching, roosting and nesting. Waste from birds and other pests (e.g., rats) can break up proper operation of the HVAC system, kick upstairs microbial growth and cause frail disease. The use of outdoor strain intake grilles with vertical louvers, As opposed to horizontal louvers, will reduce the potential for roosting.
Intake Screens essential embody accessible for inspection and cleaning. In existing schools, an insufficient number of ventilation air is often the solution of obstructed intake screens that are inaccessible for inspection and cleaning. Screens hidden past an uptake grille should be planned with a grille that is easily opened, much as a hinged wicket with two hurried-release latches, or in the inferior case, a grille with four one-twenty-five percent turn fasteners. All screens should be easily removable for cleaning.
Regard adding a section of sloping intake plenum that causes moisture to flow to the extraneous Beaver State to a drain if intake grilles are not designed to all eliminate the intake of rainfall or pull the wool over someone's eyes.

Outdoor Vent Quantity

Classrooms and other school spaces moldiness be ventilated to remove odors and other pollutants.

The national consensus canonical for outside air ventilation is ASHRAE Standard 62.1-2001, available at ASHRAE

If outside air is provided through a mechanical system, and then at least 15 cubic feet per minute (cfm) of outside melodic phrase must be provided for each occupant. A emblematic classroom with 30 people requires a minimum of 15 x 30 or 450 cfm of outdoorsy air.

In spaces where the add up of occupants is highly variable so much as gyms, auditoriums and multipurpose spaces, demand controlled external respiration (DCV) systems can Be accustomed vary the amount of outside tune ventilation in these spaces in reception to the number of occupants. One technique for doing this is to install carbon paper dioxide (CO₂) sensors that measure concentrations and vary the volume of outside air accordingly.

If an auditorium fills in the lead for civilize assembly, and then CO₂ concentrations will increase, a signal testament be provided to the HVAC system and international air volumes will equal increased accordingly. When the spaces served by an air handler have extremely variable occupancy, this type of control bathroom both save DOE and help control wet (and mold) by reducing the quantity of humid outside air when it is not needed for ventilation. CO₂ and other sensors must be periodically calibrated and preserved.

Air Filtration

In addition to "atmospheric dust," airborne particulates can admit pollen, mold (plant life) spores, animal dander, louse proteins, pesticides, lead and health problem bacteria and viruses. Designers can incorporate features into the ventilation system that will allow for benefits for the school occupants as well as the efficiency and longevity of the HVAC system of rules. In addition, these features can reduce the need for expensive cleaning of the duct work and aura handling units.

Filter Efficiency

Air filters should have a dust-office rating 'tween 35% and 80% surgery a Minimum Efficiency Rating Value (MERV) of between 8 and 13. The high the rating, the best the protection for the equipment and the occupants. IT has been estimated that a 30% increase in unmoving imperativeness across a coil results in a $200 per 10,000 cfm of air out movement (at 7 cents per KWH). This does not include the added price of cleaning dirty warming or cooling oils, drain pans, or publicize ducts. Designers should debate specifying a low efficiency (~10%) pre-filtrate upstream of the main filters. The pre-filters are by and large easy and tuppeny to change and will capture a significant amount of the particulate mass in everyone's thoughts thereby extending the useful life of the more high-ticket principal filters.
- See ASHRAE Standard 52.2-1999 Method acting of Testing Unspecialised Ventilation Air Cleansing Devices for Remotion Efficiency by Particle Sizing available at ASHRAE

Pressure Drop

Design more strain surface area into ventilation systems. This has two advantages: the number of permeate changes per year is reduced, thereby reducing the cost of labor to by rights hold the filters; and static pressure loss is lower, which saves money by reducing the amount of mogul necessary to operate fans and blowers. Since diametric filter media are approximately proportional in their efficiency/pressure pretermit ratio, the most effective method for reduction pressure drop is to design more filter surface area into the filter system. This terminate be done by the specification of a filter with larger amounts of surface area, much as a pleated filter or traveling bag filter. The next method is to increase the enumerate and/or size of the filters in the airstream, for instance, by mounting the filter slots in a "V" pattern, rather than a filter rack that is bu flat and perpendicular to the airstream.

Monitoring Pressure

Consider installing a apiculate pressure differential gauge across all filter banks. This will prevent school facilities personnel from having to guess whether the filter is ready for replacement. A gauge with a range of zero to 1.0 in. w.g. can save money and the surround by preventing premature disposal of filters that still wealthy person useful life and fire prevent health and maintenance problems caused by overloaded filters that have blown out. The gauge should exist easily visible from a standing place in an easy accessed location all but the air handling whole.

Air Cleansing for Aeriform Contaminants

The most effective means of reduction exposure of occupants to gases and VOCs is to pull off and assure potential befoulment sources. Filters are available to remove gases and fickle organic contaminants from ventilation air; yet, because of monetary value and maintenance requirements, these systems are not generally used in normal occupancy buildings or schools. In specially designed HVAC systems, permanganate oxidizers and activated charcoal English hawthorn exist old for gaseous removal filters.

Some manufacturers offer "partial shunt" carbon paper filters and carbon impregnated filters to reduce volatile organics in the ventilation breeze of office environments. Gaseous filters mustiness be on a regular basis maintained (replaced or regenerated) in order for the system to continue to operate effectively.

See also "Residential Melody Cleaners (2nd Variation): A Succinct of Available Information."

Ventilation Controls

Although a typical HVAC system has many a controls, the control of outdoor air measure that enters the edifice can have a significant impact on IAQ, yet typically is non part of canonic practice. Call for possessed ventilation is self-addressed as a method of humidity control, but is not otherwise discussed Hera because its primary use is to abridge the cater of outdoor air below the recommended stripped for the purposes of saving energy, not for improving IAQ.

See much about Humidity Control

Volume Monitoring and Control condition

Provision fit quantities of outdoor air to occupied spaces is a critical component of good indoor air caliber. Yet intimately all school ventilation systems cannot indicate whether outdoor air is even being supplied to the school, much less gauge the quantity of that air. Virtually completely active cultivate ventilation systems bank upon a fixed damper to regulate the amount of outdoor air.

Yet wind, push-down stack effect, brainsick supply and give back fans and constantly changing variable air volume (VAV) systems fundament cause significant under- or terminated-ventilation, which can affect IAQ and energy costs. Combinations of these effects can even cause the intake system to actually exhaust air.

Specify the addition of a measuring station that actively controls the amount of outdoorsy airflow by modulating the outdoorsy air damper and the return (recirculation) muffler, if needful to overcome wind and stack personal effects. These measuring stations are planned to work in limited canal space and with forward air velocities. This is an easy task, as some manufacturers bid their airflow measuring Stations in separate packages with dampers and actuators and others are built into the AHU at the factory.

Moisture and Humidity Control

Wild moisture indoors stool cause major damage to the building structure, also as to furnishings and to finish materials like floors, walls and ceilings. Uncontrolled moisture can trigger mold increase which not only damages the school facility, just can lead to health and carrying out problems for students and staff.

Primary causes of indoor wet problems in new schools include:

Use of building materials that were repeatedly Beaver State deeply wetted before the building was fully fenced in
Poor control of rain and snow, resulting in roof and bright leaks
Wet operating room soften expression cavities
Moisture-load outdoor air entering the building
Abridgement happening caller surfaces

Dominant moisture entry into buildings and preventing condensation are critical in protective buildings from molding and past moisture-related problems, including terms to building components.

Visit the Moisture Control page for more moisture information.

Air Distribution and Duct Insularism

Soil and moisture should not comprise present in duct systems and must be controlled to prevent mold growth. Nonetheless, it is not e'er possible to guarantee that ducts remain dirt and moisture free. In many existing schools, canvass metal ducts, American Samoa wellspring as those constructed of or seamed with insulant products, are often impure with mold because dirt and moisture found their way into the system.

Canal board and duct liner are widely used in duct systems because of their excellent acoustic, thermal and compression control properties. If the HVAC system is properly designed, fabricated, installed, operated and maintained, these epithelial duct systems pose no greater risk of mold growth than channel systems made of sheet metal or any other materials.

However, the very properties that make duct board and channel liner arch insulators (e.g., a fibrous structure with large opencast area that creates insulating air pockets), also makes them capable of caparison and retaining moisture if they execute get wet (though the fibers themselves do not take up wet).

While there is an ongoing debate around the wisdom of using insulation materials in duct systems that power hold back moisture thirster, all sides agree that extraordinary attention to preventing wet contamination of the epithelial duct work should be the primary scheme for preventing mold growth. See ANSI/ASHRAE Addenda 62t and 62w, Addenda to ANSI/ASHRAE Regulation 62-2001, Public discussion for Acceptable Indoor Air Calibre.

As a secondary scheme, designers should consider methods of reducing the potential for future problems to occur receivable to unforeseen wet pollution by investigating insulation products at once on the marketplace that minimize the potential for moisture to penetrate the insulation material. These include foil vapor retarders, tightly bonded non-plain-woven vapor retarders, butt or shiplap edges and other techniques that have been formed by insulation manufacturers to address concerns about moisture.

Pay special attention to preventing wet from entering duct work. Preventing moisture from entering duct work is critical to preventing influence problems in all types of ducts. Moisture in ducts is usually due to insight of precipitation through recess louvers, excess wet in outdoor air, Oregon condensation droplets from cooling coils that are not properly drained operating theatre ducts that are not properly sealed. Under indisputable destiny, when exceeding recommended level bes cooling volute face velocity, water droplets can elude cooling coils and follow carried into the zephyr stream, saturating any dirt Beaver State dust downstream. Because dust and dirt serve as a nutrient seed for mold and are usually present in about brand name spick-and-span duct systems, mould will raise on some duct surface that clay wet.
If specifying duct board or internal duct facing for thermal and/or physics control, be in for to consider the potential for uncontrollable moisture to get in the canal over the life of the system. Select products that will minimize the potential for moisture retention in the event of unforeseen pollution of the canal system, such as those with properties that reduce the potential for moisture to infiltrate the air flow surface. Ensure that all duct systems are right fictional and installed.
Degrease sheet tinny air ducts. The sheet steel victimized to make ducts has a fine petroleum or Pisces the Fishes oil coating primarily well-intentioned to inhibit corrosion during transportation and storage of the steel. This coating may trap dirt particles, just about people find the odor objectionable and there are concerns that the emissions from the covering could affect individuals with asthma or allergies. One root is to remove the covering from the duct victimization a mild cleaning agent, such as a household dishwashing thawed, in conjunction with a heated top-insistence sprayer.
Seal air ducts to prevent HVAC arrangement aerial leakage. In addition to significant energy losses, air leakage from HVAC ducts and aerial treatment units cause significant IAQ problems due to out of the blue airflow between indoors and outside and between areas within the school. Air leakage from supply or return canal work contributes to the condensation of humid air in building cavities and/or on the neighboring surfaces. Air escape can be particularly problematic for ducts operating theatre AHUs that are situated outside the conditioned spaces. The primary goals for the designer are to keep all flying ducts within the conditioned space and to specify that the joints and seams of all ducts, including issue ducts, are sealed exploitation an appropriate material.

Types of Breeze Statistical distribution

Nearly all schools presently use the mixed-airflow method for distribution and dilution of the breeze within the occupied space. Designers should investigate a method called vertical shift ventilation or thermal displacement ventilation. This approach successfully uses natural convection forces to reduce fan energy and carefully lift air contaminants up and away from the breathing zone.

Exhaust Air

Quick removal of concentrated air contaminants and building pressurization are two ways that wipe out systems affect IAQ. Special use areas so much as science labs, vocational/technical shops, cafeterias and interior pools already have well established regulatory codes regarding ventilation with outdoor air and negative pressure requirements with honour to adjacent spaces. Little well established areas in schools where extra exhaust ventilating system is enviable are janitor closets, copy/act rooms and humanistic discipline/crafts planning areas where off-gasing from significant quantities of materials or products may occur. These areas should be well-kept under disinclined pressure relative to adjacent spaces.

Provide exhaust ventilation for janitor's closets. If housekeeping and upkeep supplies are properly stored in janitor closets, lone decent aerial need be exhausted to place the closet under disconfirming pressure relative to surrounding rooms. As long as air does not easily leak into or from the closet through with openings such as plenums operating room utility chases, 10 CFM of air worn-out from the elbow room will typically make IT negative and prevent the buildup of air pollutants.
Ply exhaust ventilation for copy/work rooms. To boot to the encrypt-compulsory amount of outdoor air being supplied to this room for general ventilation, it is desirable to determine what types of equipment and activities the school plans for this room and to supply special exhaust ventilation for concentrated pollutant sources. Two examples of sources are copy machines and work areas for adhesives.
Most duplicator manufacturers tush provide an facultative outlet kit, which is unremarkably a kidney-shaped plastic fitting, that allows a piece of 3" or 4" diam flexible canal to follow connected between the copier and an fumes fan. This captures much of the hot up, particles, ozone and opposite pollutants and exhausts them outdoors ahead they can spread end-to-end the workroom. A small run through hood terminated a work surface, akin to a fume hood in a lab, would also be helpful to reduce exposure when adhesives, sprays, paints and solvents are being used in the workroom.
Cater exhaust ventilation for arts and crafts preparation areas where off-gassing from meaning quantities of materials or products may occur.
Consider specifying a differential blackmail proctor to monitor construction pressurization. IAQ problems are often traced to improper pressurization, which causes unexpected airflow betwixt indoors and outdoors and 'tween areas within the schooltime. To reduce founding of naive moist air and pollutants from outdoors, the edifice should glucinium premeditated to operate between zero point and 0.03 in. w.g. (0 to 7 Pa) positive, relation to outdoors.
Do not function exhaust systems when the HVAC organization is turned off to ward of bringing in unconditioned moist air that may condense on cooler interior surfaces.

Artful for Businesslike Operations and Maintenance

Ensure that every system components, including air out handling units, controls and fumes fans are easily ready to hand.

To help ensure that straight-laced operation and criminal maintenance of HVAC system of rules components will live performed, IT is critical that the interior designer makes the components easily accessible. AHUs, controls and exhaust system fans should non deman a ladder, the removal of ceiling tiles, or crawling to gain access. Rooftop equipment should be come-at-able away way of stairs and a full-sized door, not a secure ladder and a hatch.

Mark up HVAC scheme components to help trading operations and maintenance.

Labeling of HVAC components is an inexpensive and effective method for helping facilities personnel department properly operate and keep off the HVAC systems. The labels should personify easy to register when standing next to the equipment and long to match the lifetime of the equipment to which they are related to. At a minimum, the following components should atomic number 4 labeled in each breathing zone of the school and should correspond with the HVAC diagrams and drawings. "AHU" refers to any air manipulation unit that is associated with outdoor air supply.

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The number or figure of the AHU (e.g., AHU ##, OR AHU for West Wing)

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The outdoor air (OA), supply air (Storm Troops), return atmosphere (RA) and exhaust Oregon rest period free-flying (EA) connections to the AHU, each with arrows noting proper airflow direction

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The access threshold(s) for the air filters and the minimum filter dust-pip (or MERV) efficiency (Air Filters, nominal xx% dust spot efficiency)

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The trickle pressure gage and the recommended filter change pressure (Filter Pressure, max 0.x in. w.g.)

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The access door(s) for the condensate drainpipe tear apart (Drain Pan)

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Other pertinent access doors such as to energy recovery ventilation wheels Oregon plates (Energy Recovery Ventilation Unit of measurement)

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The minimum number of outdoor publicise for each AHU (### CFM minimum during occupied multiplication)

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The alfresco air damper (OA Damper), with special marks noting when the damper is in the fully closed (Closed), fully agaze (open) and minimum designed position (Fukien)

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If a motorized relief damper is installed (EA Damper), note the same positions every bit above.

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The entree door to any outdoor air controls (OA Command(s)) such as muffler position adjustments, outdoor airflow measuring Stations, resets, fuses and switches)

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Breakers for exhaust fans (Exhaust Rooter ##), AHU, unit ventilators

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Access doors for inspection and maintenance of air ducts

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Any dampers and controls for line side economizers (as appropriate)

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The list or name of all exhaust fans, including the air measure exhausted (EF##, ###CFM)

Commissioning

Building commission is a calibre self-assurance program that is intended to show that the building is constructed and performs as designed.

More information on commissioning HVAC and other building systems

Commission key building systems.

Engage a commission agent (the person responsible for implementing the commission plan) during the schematic design phase Oregon early. The factor Crataegus laevigata be a member of the figure team, an independent contractor, or a member of the school district staff;
Collect and review documentation on the design intent;
Make sure commissioning requirements are included in the construction documents;
Write a commissioning plan and use it end-to-end design and grammatical construction;
Verify installation and functional execution of systems;
Document results and develop a commissioning report.

References and Resources

IAQ Tools for Schools Action Kit up EPA document 402-K-07-008, January 2009
Building Beam Quality: A Guide for Building Owners and Facility Managers EPA document # 402-F-91-102, December 1991
Zip Efficiency and Indoor Air Calibre in Schools Businesses : ENERGY Maven
High Performance Construction Guidelines (PDF)(146 pp, 2.2 MB, About PDF), April, 1997, city of New York, Department of Design and Construction
Collaborative for High Functioning Schools (CHPS): CHPS has developed a unsurpassed practices manual to assistance schools, districts and practitioners to achieve superior performance design, grammatical construction and operation
Humidity Control Design Guide on for Inferior and Institutionalized Buildings. Harriman, Brundrett and Kittler. American English Social club of Heating, Cold and Air conditioner Engineers. ISBN 1-883413-98-2.
The Sheet Auriferous and Airwave Conditioning Contractor's National Affiliation (SMACNA) IAQ Guidelines for Occupied Buildings Low-level Grammatical construction