STJH-BACKDRAFT-DAMPER-VERTICAL-INTAKE

Backdraft Damper Vertical-Mount Intake

A gravity-operated intake damper for vertical wall or duct openings.

The intake flange establishes a clear mounting side.
Light blades provide passive operation for normal ventilation duty.

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Product Introduction

The intake-side flange seats against the entering-air side of the opening. Horizontal airflow lifts the aluminum blades away from their stops; the vertical installation lets them settle closed when forward flow is lost.

Key Features

The intake flange establishes a clear mounting side.
Light blades provide passive operation for normal ventilation duty.

Technical Parameters

Installation	Vertical
Airflow Direction	Horizontal intake
Flange Position	Intake side
Frame	Galvanized steel
Blades	Aluminum
Return Mechanism	Gravity closing
Typical Opening Pressure	Approximately 0.009 in. w.g.; varies with size
Maximum Air Velocity	1500 fpm
Reverse Pressure Limit	2 in. w.g.
Customization	Available to match the intake opening and operating conditions.

Applications

Ventilation intake plenums
Vertical branch intake openings

Solutions for Your Application

The intake flange could be installed on the wrong face.

Use the incoming-air flange as the seating face and preserve the blade opening direction.

Reverse airflow occurs when the supply fan stops.

The freely pivoting blades fall onto their closing stops without a control signal.

Available Options

Opening width and height
Flange dimensions

Planning a Backdraft Damper Vertical-Mount Intake specification?

Send us your dimensions, installation conditions, performance targets and required surface finish.

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