Sheet Metal & Air Conditioning Contractors’ National Association


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Guidelines for Roof Mounted Outdoor Air-Conditioner Install


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Contains guidelines for installation of roof-mounted outdoor air-conditioner equipment as developed by SMACNA and the Air-Conditioning, Heating and Refrigeration Institute (AHRI). To be used as a supplement to the unit manufacturer's specific installation instructions.

This booklet of waterproofing illustrations and reminders covers curb and roof penetrations and sealings, as well as the interface between the roof and the location at which the unit, piping, electrical wiring or sheet metal ductwork pass through the roof. This guideline supersedes AHRI Guideline B-1986.