BackdraftDampers

Backdraft Damper TrainingApplicationBackdraft dampers allow air to flow in one direction only and prevent unwanted (hot/cold outside air, wind, etc.) fromback-drafting into the building.

They only install in ducts, at walls, or in roofs and open automatically when air flows in the intended direction and automatically close when there is no air pressure or when airflow is in the opposite direction.Basic Functions Intake/Exhaust Barometric/Pressure Relief

Backdraft Damper TrainingIntakeIntake backdraft dampers allow supply airflow into a building while preventing conditioned air from escaping when the fan is off.

Typical Applications Intake Air Duct - Wall or plenum mounted Intake side of rooftop evaporative cooler (requires counterbalance)

Backdraft Damper TrainingExhaustExhaust backdraft dampers allow air to automatically exit the building and prevent outside air from entering the building.Typical Applications In tandem with wall mounted exhaust fan. Exhaust air duct - wall or plenum mounted Roof top power ventilator Rooftop gravity ventilator

Backdraft Damper TrainingBarometricBarometric relief dampers open automatically under low velocity conditions - including natural airflow - and close automatically to prevent reverse airflow.

Typical Applications Rooftop gravity ventilator Wall mounted relief (no duct or fan)

Backdraft Damper TrainingPressure ReliefPressure relief dampers use counterbalance weights to maintain a relatively constant upstream pressure, they open automatically at higher pressures and close automatically when pressures drop.Typical Applications Duct or plenum relief Room relief

Backdraft Damper TrainingAMCA 500D Test RequirementsTest Samples Pressure drop: 12x12, 12x48, 48x12, 24x24, 36x36

Pressure Drop Ducted Inlet and Outlet - AMCA 5.3 Lowest Pressure Drop Ducted Inlet Only - AMCA 5.2 Plenum Mount - AMCA 5.5 (Highest Pressure Drop)

Backdraft Damper TrainingDesign Basics and Typical ApplicationLight Duty Most common type and widely used for intake, exhaust, barometric, and pressure relief applications where air pressures and velocities are low ( 2 in wg. & 1250 fpm).Medium Duty Typically used for intake, exhaust, and pressure relief when pressure or velocity exceeds the light duty range (>2 in wg. & 1250 fpm, but 3 in. wg. And 2500 fpm.Industrial Employed when the temperature, pressure, or velocity exceed standard commercial damper limits. Units are typically flange mounted directly to the duct or fan housing.

Backdraft Damper TrainingLight Duty Backdraft DampersApplicationsBD-50Gravity Intake and Exhaust Prop-Fan Exhaust Roof Top Power VentilatorBD-51Intake or Exhaust where damper blade noise is a concernBD-52Evaporative Cooler Discharge Side (down-flow only)BD-54Pressure ReliefMounting ArrangementsVertical Mount Horizontal MountUp-flowDown-flow (BD-52 Only)CautionMultiple SectionsMaximum Velocity & Pressure LimitsNo Exact Pressure Settings

Backdraft Damper TrainingMedium Duty Backdraft DampersApplicationsBD-60Fan Exhaust - Duct or Plenum MountBD-64Pressure Relief - Higher velocityMounting ArrangementsVertical Mount Horizontal MountUp-flow onlyCautionLow-end velocity and pressure limitsNo Exact Pressure Settings Retarding Counterbalance Design Only - No assist to Open

Backdraft Damper TrainingIndustrial Backdraft DampersApplicationsBD-84Fan Exhaust - duct or plenum mountMounting ArrangementsVertical Mount only CautionLow-end velocity and pressure limitsNo Exact Pressure Settings Assist to Open Counterbalancedesign only

Backdraft Damper TrainingOptions & AccessoriesFlange Frame For flush mounting to equipment/wall Intake or discharge Sleeve

304 Stainless Steel Construction

Electric Actuator (BD-58 Only)

Backdraft Damper TrainingTHANK YOU!