Fantech 4" - 16" Spring Loaded Backdraft Damper - Fantech RSK4, RSK5, RSK6, RSK8, RSK10, RSK12, RSK14, RSK16
Backdraft dampers with
galvanized steel collar and lightweight aluminum damper blades. Spring loaded
for positive closure.
Fantech Accessories Book - PDF
Dimensional information in inches. *) Duct connections are 1/8"
smaller than duct size.