



Ventilation Ducting Air Distribution Parts From $37.99 to $259: Damper, Flex Duct, or Return Air Box?
Compare four ventilation ducting air distribution options-a 4-inch manual damper, a 6-inch R-6.0 flex duct, a 17.5x21x16-inch return air box, and an 8-inch R6 flex duct-with listed prices from $37.99 to $259.


















































