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Requirements
Prerequisites
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. |
Bathroom |
50 cfm |
Credits
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. See all forum discussions about this credit »What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
Learn more about The Cost of LEED v4 »Frequently asked questions
See all forum discussions about this credit »Documentation toolkit
The motherlode of cheat sheets
LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
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. |
Bathroom |
50 cfm |
