Easy to install in-line as part of standard air duct.
Durable, patented HOYME 'spring motor drive' with nylon bearings.
26 ga. galv. steel from 4"Ø to 5"Ø.
8"Ø dampers and smaller are 8" in length
These dampers can be used for the new ventilation code which requires a designated exhaust fan, a centrally located switch marked 'VENTILATION' and a fresh air intake damper, all interconnected to the furnace circulation fan.
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