Meyer
Registered User
I am being asked by City of West Hollywood to provide calculation for exhaust ducts exceeding 14' in length. Anybody know what calculations is he referring to? Is it esp calculation?
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Exhaust Correction
- Thread starter Meyer
- Start date
Welcome
If not known, it is always good to ask the nice plan reviewer or inSpector,
The code section they are using.
So you can research it and assure it is applied correctly
14' comes into play with clothes dryers. The length of environmental air ducts serving exhaust fans is dictated by a fan's installation instructions. The installation instructions for a clothes dryer might result in a length greater than 14'.
504.4.2.1 Length Limitation. Unless otherwise permitted or required by the dryer manufacturer’s instructions and approved by the Authority Having Jurisdiction, domestic dryer moisture exhaust ducts shall not exceed a total combined horizontal and vertical length of 14 feet (4267 mm), including two 90 degree (1.57 rad) elbows. A length of 2 feet (610 mm) shall be deducted for each 90 degree (1.57 rad) elbow in excess of two.
You might need a bigger fan to achieve a certain cfm.
504.4.2.1 Length Limitation. Unless otherwise permitted or required by the dryer manufacturer’s instructions and approved by the Authority Having Jurisdiction, domestic dryer moisture exhaust ducts shall not exceed a total combined horizontal and vertical length of 14 feet (4267 mm), including two 90 degree (1.57 rad) elbows. A length of 2 feet (610 mm) shall be deducted for each 90 degree (1.57 rad) elbow in excess of two.
You might need a bigger fan to achieve a certain cfm.
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