The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

• Width and height furnished approximately 0.125 in. under size

Hinge kit allows the fan to hinge at the base of the curb cap for access to the wheel and ductwork for inspection and cleaning.

Curb adapters are designed to adapt standard curb cap dimensions to existing curb when replacing a fan or ventilator. Constructed of galvanized steel. For use with AE-10, AS-10, CUBE models, sizes 099 through 131, CUE models, sizes 080-099 and GB models, sizes 071 through 131.

• Increases mounting area of fan base to fit larger curb
• Adapt your existing curb to a new rooftop unit
• Allows for quick and easy replacements
• Galvanized steel construction

Curb adapters are designed to adapt standard curb cap dimensions to existing curb when replacing a fan or ventilator. Constructed of galvanized steel. This reducer is for use with AE-10, AS-10, CUBE models, sizes 099 through 131, CUE models, sizes 080-099 and GB models, sizes 071 through 131.

• Reduces mounting area of fan base to fit smaller curb
• Adapt your existing curb to a new rooftop unit
• Allows for quick and easy replacements
• Galvanized steel construction

Model GPF roof curbs are designed for high wind applications and flat roof installations. Constructed of heavy gauge galvanized steel and fully formed on three sides with a single, fully welded seam.

• Designed to fit 19" roof curb cap
• 2-inch mounting flange
• Rigid, fiberglass insulation
• Welded, straight-sided construction

Hinge curb bracket kits allow the fan to tilt away from the curb for access to the wheel and ductwork for inspection and cleaning.

GPI roof curbs are designed for flat, insulated or non-insulated roof decks. Constructed of 18 gauge galvanized steel and fully formed on three sides with a single, fully welded seam.

• Designed to fit 19" roof curb cap
• 2-inch mounting flange
• Rigid, fiberglass insulation
• Welded, straight-sided construction

GPI roof curbs are designed for flat, insulated or non-insulated roof decks. Constructed of 18 gauge galvanized steel and fully formed on three sides with a single, fully welded seam.

• Designed to fit 19" roof curb cap
• 2-inch mounting flange
• Rigid, fiberglass insulation
• Welded, straight-sided construction

Model GPF roof curbs are designed for high wind applications and flat roof installations. Constructed of heavy gauge galvanized steel and fully formed on three sides with a single, fully welded seam.

• Designed to fit 19" roof curb cap
• 2-inch mounting flange
• Rigid, fiberglass insulation
• Welded, straight-sided construction

Speed controls are used for manual adjustment of the fan’s performance (for final system balancing) or to control the fan’s output in confined spaces, such as conference or meeting rooms. The fan can be adjusted to 60% of design airflow with a speed control. This reduction in airflow and fan speed is also accompanied by a reduction in noise level. Note: For use on direct drive fans with single phase, PSC or shaded pole motors.

GPI roof curbs are designed for flat, insulated or non-insulated roof decks. Constructed of 18 gauge galvanized steel and fully formed on three sides with a single, fully welded seam.

• Designed to fit 19" roof curb cap
• 2-inch mounting flange
• Rigid, fiberglass insulation
• Welded, straight-sided construction

Speed controls are used for manual adjustment of the fan’s performance (for final system balancing) or to control the fan’s output in confined spaces, such as conference or meeting rooms. The fan can be adjusted to 60% of design airflow with a speed control. This reduction in airflow and fan speed is also accompanied by a reduction in noise level. Note: For use on direct drive fans with single phase, PSC or shaded pole motors.