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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To minimize moisture problems and occupants’ exposure to indoor pollutants through enhanced exhaust and ventilation systems.
Requirements
Option 1. Enhanced Local Exhaust (1 point)
Use one of the following strategies in every bathroom with a shower, bathtub, or spa (i.e., half-baths are exempt) to control the use of the local exhaust fan:
- an occupancy sensor;
- an automatic humidistat controller;
- a continuously operating exhaust fan; or
- a delay timer that operates the fan for at least 20 minutes.
AND/OR
Option 2. Enhanced Whole-House Ventilation (2 points)
Install a balanced whole-house ventilation system (not just exhaust only or supply only) that meets the minimum ventilation requirements of ASHRAE Standard 62.2–2010, Sections 4 and 7, or local equivalent whichever is more stringent. Program the system such that it does not exceed the standard’s requirements by more than 10%.
For multifamily buildings, meet the above requirements for all in-unit residential spaces in both options 1 and 2.
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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
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To minimize moisture problems and occupants’ exposure to indoor pollutants through enhanced exhaust and ventilation systems.
Requirements
Option 1. Enhanced Local Exhaust (1 point)
Use one of the following strategies in every bathroom with a shower, bathtub, or spa (i.e., half-baths are exempt) to control the use of the local exhaust fan:
- an occupancy sensor;
- an automatic humidistat controller;
- a continuously operating exhaust fan; or
- a delay timer that operates the fan for at least 20 minutes.
AND/OR
Option 2. Enhanced Whole-House Ventilation (2 points)
Install a balanced whole-house ventilation system (not just exhaust only or supply only) that meets the minimum ventilation requirements of ASHRAE Standard 62.2–2010, Sections 4 and 7, or local equivalent whichever is more stringent. Program the system such that it does not exceed the standard’s requirements by more than 10%.
For multifamily buildings, meet the above requirements for all in-unit residential spaces in both options 1 and 2.