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What is the maximum roof pitch that a fan can be mounted to without correcting the curb for the pitch?

April 26, 2017correcting curb fan maximum mounted pitch roof

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What is the maximum roof pitch that a fan can be mounted to without correcting the curb for the pitch?

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As a general rule, the recommended maximum roof pitch is 2:12 or 10 degrees from horizontal. Steeper pitches will increase the possibility of moisture infiltration into the building as a result of water splashing off the roof and entering the fan. For roof pitches greater than 2:12, it is recommended to have a pitched curb, which will allow the fan to sit level and not at an angle.