Reduce moisture and exposure to indoor pollutants in kitchens and bathrooms.
5.1 Basic local exhaust. Meet all the following requirements:
- 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.
- Design and install the fans and ducts to meet the requirements of Section 7 of ASHRAE Standard 62.2-2007.
- Exhaust air to the outdoors (i.e., exhaust to attics or interstitial spaces is not permitted).
- 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.|
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.