FAQs
How can I access the 2021 Codes as adopted by the City of Austin?
How can I access the 2021 IECC model code?
What is the code citation requiring mechanical ventilation testing?
2021 IECC R403.6.3 Testing.
What are the target airflows for whole-dwelling mechanical ventilation systems?
Austin uses both the Uniform and International model codes. For the 2021 IECC R403.6.3 testing requirement use Equation 15-1 from IRC-M 1505.4.3 as the target to determine compliance. Measured cfm from testing must meet or exceed the calculated cfm from the equation. The equation states cfm = (0.01 x total square feet of house)+[7.5 x (number of bedrooms +1)].
What are the target airflows for bath and kitchen exhaust fans?
See IRC-M M1505.4.4 for the required local exhaust rates.
Kitchens = 100 cfm intermittent or 25 cfm continuous
Bathrooms-Toilet Rooms = 50 cfm intermittent or 20 cfm continuous
Is there an exception for kitchen exhaust fans?
Yes, kitchen range hoods that are ducted to the outside with 6-inch or larger duct and not more than one 90-degree elbow or equivalent in the duct run.