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Code Requirements

Every state that adopts the International Energy Conservation Code may have amendments. Learn more about your state's specific code requirements below.

Maryland

Envelope leakage: <= 3.00 ACH50

Duct leakage: <= 4.0% Qn*

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Total duct leakage testing is required regardless if ductwork is in 100% conditioned space. 

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* Qn = tested CFM25 divided by area served

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Aerial View of the Delaware River Near the Commodore Barry Bridge.jpg

Delaware

Envelope leakage: <= 3.00* ACH50
Duct leakage: <= 6.0% Qn**
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* buildings 1,500 SF or less: <= 5.00 ACH50
* buildings 1,501-2,000 SF:  <= 4.00 ACH50
* buildings 2,000+ SF: <= 3.00 ACH50
** Qn = tested CFM25 divided by area served

Virginia

Blower door testing is required in select jurisdictions with a maximum ACH50 or 5.00

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