Garage Exhaust Fans

Detail ID
6.0201.4
Topic
Local Ventilation
SubTopic
Exhaust Systems
Desired Outcome

Safely and efficiently remove pollutants from garage space

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MH
Specification Objective

Select a fan that:

has an electrically commutated motor (ECM)

has an efficacy of 3.8 cfm/watt or more

exhausts 100 cfm per garage bay after installation

Efficient fan selection

  • MF
Specification Objective

Select a fan that:

has an electrically commutated motor (ECM)

has an efficacy of 3.8 cfm/watt or more

exhausts 0.75cfm/ft2 of garage area after installation

motors 1 horsepower or larger will meet NEMA premium efficiency standards

Efficient fan selection

  • SF
  • MH
  • MF
Specification Objective

Select sealants that:

are compatible with their intended surfaces,

allow for differential expansion and contraction between dissimilar materials,

meet the requirements of the applicable fire safety code (e.g., thermal or ignition barriers), and

for use inside the pressure boundary select low volatile organic compound (VOC) sealants that meet independent testing and verification protocols

Select safe and effective sealant

  • SF
  • MH
  • MF
Specification Objective

Install all electrical wiring according to manufacturer specifications and applicable code

Prevent an electrical hazard

  • SF
  • MH
  • MF
Specification Objective

Orient the fan outlet toward the final termination location and so the equivalent length of the duct run is as short as possible

Short, effective fan venting

  • SF
  • MH
  • MF
Specification Objective

Mount fan using mechanical fasteners and per manufacturer's specifications so that fan housing does not shake, rattle, or vibrate when operating

Securely mounted fan

  • SF
  • MH
  • MF
Specification Objective

If the fan does not contain an integrated damper, install a damper that:

opens in the direction of the desired flow

closes when the system is off

Prevent unwanted air movement while not restricting desired air flow

  • SF
  • MH
Specification Objective

Fan must operate continuously or have automatic controls that activate the fan whenever the garage is occupied and for 15 minutes after the garage is vacated

Correct exhaust strategy

  • MF
Specification Objective

Fan must operate continuously

Correct exhaust strategy

  • SF
  • MH
  • MF
Specification Objective

Cut hole for intakes or surface mounted fans leaving no more than a 1/4" gap on each side

Install register boots using mechanical fasteners sufficient to prevent movement

Durable intake boots with properly sized opening

  • SF
  • MH
  • MF
Specification Objective

Seal gaps around intake register boots or fan housing with compatible sealant

Seal leakage locations between living space and garage

Remove or cap and seal supply and/or return registers in garage that are connected to the same duct system as living space

Minimize air exchange between garage and dwelling

  • SF
  • MH
  • MF
Specification Objective

Ensure fan and service disconnect switch are accessible for maintenance according to NEC, or applicable building code

Accessible for service

  • SF
  • MH
  • MF
Specification Objective

Terminate exhaust venting a minimum of 15' from any doors, windows, or outside air intakes

Prevent reentry of exhausted pollutants

  • SF
  • MH
  • MF
Specification Objective

Duct and terminate fan to the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors, in accordance with SWS detail for "Ventilation Ducts"

Exhausted to outdoors

View Sub-Topic:
Exhaust Systems