20"x12" PARALLEL BLD EXT LEFT

20"x14" PARALLEL BLD EXT LEFT

Parallel Blade Damper, 16 Gauge Galvanized Frame, 3 V Style Blades, Acetal Bearings, 20" Width x 16" Height, External Left Hand Mount, Applications Where Leakage Is Not Important, Such as Return Air

20"x20" PARALLEL BLD EXT LEFT

20" X 20" Parallel damper

20"x24" PARALLEL BLD EXT LEFT

20"x26" PARALLEL BLD EXT LEFT

20"x28" PARALLEL BLD EXT LEFT

22"x12" PARALLEL BLD EXT LEFT

22"x14" PARALLEL BLD EXT LEFT