Local exhaust | U.S. Green Building Council
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LEED BD+C: Homes | v3 - LEED 2008

Local exhaust

EQc5 | Possible 2 points


Reduce moisture and exposure to indoor pollutants in kitchens and bathrooms.



5.1 Basic local exhaust. Meet all the following requirements:

  1. Design and install local exhaust systems in all bathrooms (including half-baths) and the kitchen to meet the requirements of Section 5 of ASHRAE Standard 62.2-2007. Sample requirements that relate to minimum intermittent local exhaust flow rates are shown in Table 1, below.
  2. Design and install the fans and ducts to meet the requirements of Section 7 of ASHRAE Standard 62.2-2007.
  3. Exhaust air to the outdoors (i.e., exhaust to attics or interstitial spaces is not permitted).
  4. Use ENERGY STAR labeled bathroom exhaust fans (except for exhaust fans serving multiple bathrooms).
Table 1. Minimum Air Flow Requirements for Intermittent Local Exhaust

Location Minimum air flow
Kitchen 100 cfm; vented range hood required if exhaust fan flow rate is less than 5 kitchen air changes per hour.
Bathroom 50 cfm


5.2 Enhanced local exhaust (1 point). Use one of the following strategies in every bathroom to control the use of the local exhaust fan:

a. An occupancy sensor.

b. An automatic humidistat controller.

c. An automatic timer to operate the fan for a timed interval after occupant leaves the room.

d. A continuously operating exhaust fan.

5.3 Third-party performance testing (1 point). Perform a third-party test of each exhaust air flow rate for compliance with the requirements in Section 5 of ASHRAE Standard 62.2-2007.

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