Efficiently and safely exhaust adequate ventilation air
Specifications
- MF
Specification | Objective |
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Select a fan that: has an electrically commutated motor (ECM) and/or utilizes (VFD) controllers is capable of maintaining a minimum operating static pressure of .25 inches of water column or greater motors 1 horsepower or larger must meet NEMA premium efficiency standards motors less than 1 HP must be rated by the Home Ventilation Institute to satisfy these requirements |
Adequate and efficient fan motor |
- 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 |
- MF
Specification | Objective |
---|---|
Install corrosion resistant screen, louver, or grille material over exterior termination 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. |
- MF
Specification | Objective |
---|---|
Design one or more exhaust 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 air movement between dwelling units |
- MF
Specification | Objective |
---|---|
Install all electrical wiring according to manufacturer specifications and applicable code |
Prevent an electrical hazard |
- MF
Specification | Objective |
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Mount fan 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 air handler |
- MF
Specification | Objective |
---|---|
If combining ducts, combine them on the upstream side of fan using "Y"-fittings or collection boxes Do not combine dryer, kitchen, or garage exhausts streams with any other exhaust stream |
Effective, safe exhaust of air from multiport systems |
- MF
Specification | Objective |
---|---|
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 |
- MF
Specification | Objective |
---|---|
Ensure fan and service disconnect switch are accessible for maintenance according to NEC, or applicable building code |
Serviceable parts are readily accessible |
- 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 |
- MF
Specification | Objective |
---|---|
Adjust fan speed, dampers, and registers until design specifications are met |
Ensure complete dwelling ventilation |