Non-flanged horizontal mount exhaust backdraft damper

• Sizes available: 8"W x 8"H to 30"W x 30"H
• Galvanized Steel frame with aluminum blades
• Maximum free area velocity - 2000 fpm
• Optional motor pack available (411611)
• Use in roof curbs, duct work or wall collars when using a fan or power roof ventilator
• 411 auto exhaust damper is part of the S&P Ventilation Systems Quickship program and ship out in 3 days

• Sizes available: 34"W x 34"H to 48"W x 48"H
• Galvanized Steel frame with aluminum blades
• Maximum free area velocity - 2250 fpm
• Optional motor pack available (411611)
• Use in roof curbs, duct work or wall collars when using a fan or power roof ventilator

• Sizes available: 12"W x 12"H to 48"W x 48"H
• Extruded aluminum hat channel frame with extruded aluminum blades
• Internally mounted factory installed 100-240 volt power open / spring close motor with an end switch
• Maximum free area velocity - 3500 fpm
• Use in exhaust or supply applications
• For vertical or horizontal mounting (typically walls or curbs)

• Sizes available: 18"W x 18"H to 48"W x 48"H
• Offers superior resistance to rain and weather
• Ability to completely close the opening if needed
• Standard birdscreen on the interior
• Extruded aluminum frame
• Drainable style 45 degree extruded aluminum blades
• Optional motor packs available (MTR-ACL)

• Sizes 100 to 400
• Galvanized Steel Collar
• Lightweight Aluminum Damper Blade
• Spring loaded for positive closure

• Sizes available: 12"W x 12"H to 48"W x 48"H
• Galvanized steel frame and blades
• Internally mounted factory installed 120/240 volt power open / spring close motor with an end switch
• Maximum free area velocity - 3500 fpm
• Use in exhaust or supply applications
• For vertical or horizontal mounting (typically walls or curbs)

• Sizes 4-14
• Normally closed, power open, 24V motorized damper for round ducts.
• Control the sequencing of outside air in forced air systems.
• Motorized Damper Kits.