Efficient, effective, safe, and adequate ventilation air
Specifications
- SF
- MH
- MF
Specification | Objective |
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Install all electrical wiring according to manufacturer specifications and applicable code |
Prevent an electrical hazard |
- SF
- MH
- MF
Specification | Objective |
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Terminate exhaust system to the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors Install terminations: A minimum of 3' away from any property line; A minimum of 3' away from operable opening to houses; A minimum of 10' away from mechanical intake; Above the snow-line If the termination is at the soffit, seal soffit vents within 6' of the termination |
Prevent exhaust from reentering the structure |
- SF
- MH
- MF
Specification | Objective |
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Install intake to pull air from the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors Install intake: A minimum of 6" from grade; A minimum of 10' from contaminant sources or exhaust outlets; Above local snow or flood line; A minimum of 18" above an asphalt based roof; Never on a flat roof |
Unrestricted entry of contaminant-free air |
- SF
- MH
- MF
Specification | Objective |
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Install corrosion resistant screen, louver, or grille material over exterior terminations with a hole size of no less than 1/4" and no greater than 1/2" in any direction |
Prevent pest entry while allowing proper air flow. |
- SF
- MH
- MF
Specification | Objective |
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Install interior intakes a minimum of 10' from interior fresh air supplies, cooking surfaces, or combustion appliances |
Remove pollutants without damaging fan or interfering with fresh air supply |
- SF
- MH
- MF
Specification | Objective |
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Install interior fresh air supply: near high traffic areas and occupied spaces (e.g., living rooms, hallways, bedrooms) not within 10' of interior exhaust intakes |
Supply fresh air where needed |
- SF
- MH
- MF
Specification | Objective |
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If combining ducts, combine them on the upstream side of fan using "Y"-fittings or collection boxes Do not combine/connect dryer, kitchen, or garage exhaust streams with any other exhaust stream |
Effective, safe exhaust of air from multiport systems |
- SF
- MH
Specification | Objective |
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Ensure system contains a backdraft damper between the ventilator and all exterior terminations/intakes that only allows air flow in the desired direction Equip outdoor air intakes and exhausts with automatic or gravity dampers that close when the ventilation system is not operating |
Prevent unwanted air movement |
- MF
Specification | Objective |
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Design one or more ventilation fans located upstream of all the exhaust inlets to run continuously, or install a system of one or more backdraft dampers to isolate each dwelling unit from the common duct when the fan is not running |
Prevent unwanted air movement |
- SF
- MH
- MF
Specification | Objective |
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All mechanically-supplied outdoor air must pass through a filter before combining with conditioned air Filtration must meet a minimum efficiency of MERV 8 Filter or air cleaning systems that intentionally produce ozone are not allowed. |
Outdoor air filtered for particles |
- SF
- MH
- MF
Specification | Objective |
---|---|
Mount ventilator using mechanical fasteners per manufacturer's specifications and applicable code (e.g., seismic restraints) Isolate unit from the building framing unless specifically designed to be directly attached |
Secure, vibration-isolated ventilator |
- SF
- MH
- MF
Specification | Objective |
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Seal all air moving portions of the system using UL 181 products without interfering with the function of dampers |
Airtight ventilation system with freely operating dampers |
- SF
- MH
- MF
Specification | Objective |
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If unit has a condensate drain, connect drain according to manufacturer specifications to a drain location approved by applicable code Insulate all condensate lines outside the thermal boundary to a minimum of R-4 |
Safe and reliable condensate drainage |
- SF
- MH
- MF
Specification | Objective |
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Ensure fan, service disconnect switch, filters, and drains are accessible for maintenance according to NEC, or applicable building code |
Serviceable parts are readily accessible |
- SF
- MH
- MF
Specification | Objective |
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If fire dampers are required in the fresh air supply duct, install them according to applicable building code Fire dampers must be accessible for inspection and/or testing Sealing activities must not interfere with the operation of fire dampers, balancing dampers, or backdraft dampers |
Fire dampers function effectively and are accessible |
- SF
- MH
- MF
Specification | Objective |
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In climate zones 0A, 1A, 2A (as defined by ASHRAE 62.2) it is preferential to install an ERV rather than an HRV Do not terminate ventilation air intake at the roof Determine whether net latent load from ventilation (both natural and mechanical) requires dehumidification; if so, install dehumidification |
Prevent excessive heat and moisture from entering the ventilation air. |