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Mike Lamb

Cat IV Vent Clearance

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Does the 8 foot lateral clearance to sidewalls apply to PVC Cat IV vents?  I did not see anything in the codebooks to suggest that it does not. However, I don't see anything in the manufacturer's instructions regarding this.

IMG_0898 AA.JPG

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That 8' clearance is not required for direct vent.  Think about where sidewall terminations are!

How high above the roof are those terminations?  I think it's 24" max.

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Thanks.  I found this in my library for a Rheem direct vent.  The vents are a little high.  Lateral is not an issue.

Cat IV vent termination at flat roof.jpg

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