Mechanical · A-6V7G7

Downblast Exhaust Fan Roof Curb Installation Detail

Materials

Elements

Roofs Waterproofing / Flashing Site / Paving Roof / Floor Openings

About this detail

A downblast exhaust fan mounts to a manufacturer roof curb on an elastomeric isolator pad over roof framing and roof construction. The assembly incorporates a backdraft damper or automatic control damper, with roof flashing detailed per architectural drawings and roof framing referenced from structural drawings. A variable speed controller for air balancing is mounted under the fan housing for direct drive fans only. Design notes specify compliance with Washington State Energy Code requirements for dampers and coordination with vibration isolation and HVAC specifications.

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