BDD Backdraft Dampers

Description

BDD backdraft dampers improve comfort and save energy and money by keeping unwanted air from entering a duct when a fan is not operating. This can be very beneficial in keeping outside air from being drawn into a room, or preventing the reversal of indoor air when a number of fans are joined to exhaust through a common duct.  Utilizing a backdraft damper in this manner prevents air that is being exhausted from one area from backing up into other areas connected by the common duct.

BDD backdraft dampers are available in the spring-loaded and gravity style backdraft dampers. The spring loaded dampers feature a center pin design in 4″, 5″, 6″, & 8″ models and a center post design in 10″ & 12″ models. The gravity damper features a galvanized steel housing and aluminum butterfly damper blades.

Features & Benefits of BDD Backdraft Dampers

Spring Loaded Backdraft Dampers

• Neoprene damper seal minimizes leakage
• 20 gauge steel housing, aluminum spring loaded butterfly damper blades
• Gasket designed to withstand temperatures from -22 F to 180 F
• Requires from 0.04 to 0.08 in. wg pressure to open
• Simple installation in any position – entire assembly inserts into duct
• Exterior foam gasket assures a tight seal against duct
• 4″, 5″, 6″ & 8″ sizes include stamped metal sleeve with center pin design
• 10″ & 12″ sizes include rolled metal sleeve with center post design

Gravity Operated Backdraft Dampers

• Low air leakage design
• Galvanized steel housing, aluminum butterfly damper blades
• Gravity operated closure
• Install in horizontal or vertical (upblast only) position
• Suitable for supply or exhaust applications
• Available in three sizes: 7″, 14″ & 16″ sizes

Select the Charts / Diagrams tab below for performance and dimension details on the following BDD models:

Spring Loaded Backdraft Damper Models:

• BDD100
• BDD125
• BDD150
• BDD200
• BDD250
• BDD300

Gravity Operated Backdraft Damper Models:

• BDD175
• BDD355
• BDD400

Visit CFM Select to utilize Continental Fan’s state-of-the-art fan selection and quotation platform.

Learn more about How to Prevent Air Leakage in our residential ventilation solutions page.