An exhaust fan mounts to a factory curb with leveling and flashing detailed on the architectural drawings, penetrating the roof deck. A backdraft damper and flexible connection are installed at the throat of the unit, while a quarter-inch mesh wire screen protects the intake or discharge opening. Tagged designations such as EF-2 through EF-8 identify the specific units. A general note mandates that all heat pump units, exhaust fans, thermostats, and breakers must be labeled sequentially and rooftop units stenciled accordingly.
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