Pottorff Backdraft Damper, BD-50 Model, 14 x 14 in Size, Leakage: 9.5 cu-ft/min/sq-ft at 3.5 in WG, 8.5 cu-ft/min/sq-ft at 3 in WG, 7 cu-ft/min/sq-ft at 2 in WG, Formed Blade, Extruded Aluminum, Horizontal Upflow/Vertical Mounting, -25 to 150 deg F, 2 in L

• Backdraft damper employs gravity operated formed-style blades to restrict reverse airflow and to permit the forward flow of air in the intended direction
• The BD-50 damper may be-mounted vertically or horizontally in either exhaust or intake installations for low velocity and pressure applications
• Constructed with 2 x 1/2 x 0.06 in extruded aluminum channel frame and 24 ga formed aluminum blades
• Nylon bushings
• They are constructed for vertical-mounting and horizontal upflow
• Aluminum tie bar interconnects all blades for increased stability at higher velocities upto 1250 ft/min
• Blade edge open cell neoprene gaskets reduce leakage and noise
• Units supplied approximately 1/4 in under nominal duct dimension
• Neoprene blade edge seals
• Exposed, on-blade linkage
• 3/16 in Dia synthetic axles
• 5 years warranty

• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/Pottorff_W_11902_Specification_Sheet.pdf