Kitchen Range Hoods

Select a fan that:

is rated a maximum of 3 sones at one or more airflow settings greater than or equal to 100 cfm

has a minimum efficacy of 2.8 cfm/watt

moves at least 100 cfm intermittently or 5 kitchen air changes per hour (ACH) continuously after installation, ducting, and termination is complete

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

Install fan within at least 5' of the primary cooking surface (e.g., range, oven, stove)

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

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

Ensure internal components are correctly oriented to exhaust air through the duct system

Install all electrical wiring according to manufacturer specifications and applicable code

Seal any gap around fan housing where air can leak to outside the pressure boundary

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

Duct fan flow through smooth wall metal duct and terminated 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"