Reduce moisture and exposure in indoor pollutants in kitchens and bathrooms.
Prerequisites (Mandatory Measures)
5.1 Basic local exhaust. Meet all of the following requirements:
- For each individual dwelling unit, design and install local exhaust systems in all bathrooms (including halfbaths) 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 19, below.
- For each individual dwelling unit, 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).
- For all spaces outside dwelling units, meet the requirements for local exhaust from ASHRAE Standard 62.1-2007.
Credits (Optional Measures)
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:
- An occupancy sensor.
- An automatic humidistat controller.
- An automatic timer to operate the fan for 20 minutes or more after occupant leaves the room.
- 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 relevant requirements: Section 5 of ASHRAE 62.2-2007 for in-unit exhaust; Table 6-4 in ASHRAE Standard 62.1-2007 for spaces outside the dwelling units.
|Table 19: ASHRAE 62.2 Requirements: Minimum Air Flow Requirements for in-Unit Local Exhaust|
|Location||Minimum Air Flow: Intermittent||Minimum Air Flow: Continuous|
|Kitchen||100 cfm||5 ACH|
|Bathroom||50 cfm||20 cfm|