Backdraft / Shutter Dampers are designed to allow airflow in one direction and automatically prevent reverse flow when the system is off or when pressure conditions change. These gravity-operated dampers open with airflow and close when airflow stops, helping to protect HVAC systems from drafts, wind-driven rain, and unwanted air infiltration. Commonly used in exhaust and intake applications, they are ideal for systems that do not require motorized control.

Pressure Relief Dampers function similarly to backdraft dampers but include an adjustable start-to-open pressure setting. They are engineered to automatically relieve excess pressure in a system while maintaining a sealed environment under normal conditions. These dampers are ideal for protecting equipment and ductwork by controlling over-pressurization in supply or return air systems, clean rooms, or pressurized enclosures.

Configurations
Single Thickness or Teardrop-Style Blades Rectangular or Round Construction

Onshore / Offshore Applications
Exhaust or intake functions in fast power generation, natural gas or coal-fired power plants and natural gas compressor stations applications, redundant ventilation systems
General exhaust in utility or refinery applications
Pressure relief in steel mill applications

Maximum Temperature:
300+ Degrees Fahrenheit
Maximum Pressure:
13”+ w,g,
Maximum Face Velocity:
6,500 + fpm
Material of Construction:
Galvanized
Aluminum
304 or 316 Stainless Steel
Carbon Steel
Bearing Types:
Oil Impregnated Bronze Sleeve Bearings
316 Stainless Steel Sleeve Bearings
Plated Steel or Stainless Steel Press Fit Ball Bearings
Plated Steel or Stainless Steel Relubricable Ball Bearings
Carbon Graphite Sleeve Bearings

Blade & Jamb Seals:
Vinyl
Silicone
EPDM
Stainless Steel
Neoprene (Ameriprene)
Ceramic
Actuators:
Counter-balance
Finishes:
Sandblast surface prep (SSPC-S3, S6 or S10)
Air dry enamel (to match a specific color)
Epoxy
High-temperature enamel
Other Features
Bubble tight (zero leak for hazardous locations): Round
and rectangular available.
Refractory-lined dampers (withstand up to 1,800 degrees
Fahrenheit for high-temperature ductwork): Round and
rectangular available.
Seal air fan dampers (zero leak for critical paths): Seal air
fan pressurizes damper cavity for no leakage