STJH-BACKDRAFT-DAMPER-HORIZONTAL-UPFLOW

Backdraft Damper Horizontal-Mount Vertical-Upflow

Spring-assisted backflow protection for an upward exhaust path.

Opening assistance helps the blades respond to a small forward pressure.
A simple mechanical arrangement avoids an electrical control connection.

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Product Introduction

A horizontal frame supports lightweight blades that lift with rising air. When upward flow stops, the assembly closes automatically. Its duct-insert construction is intended for a vertical air path rather than a wall opening.

Key Features

Opening assistance helps the blades respond to a small forward pressure.
A simple mechanical arrangement avoids an electrical control connection.

Technical Parameters

Mounting Plane	Horizontal
Forward Airflow	Vertically upward
Frame Material	Galvanized steel
Blade Material	Aluminum
Opening Assistance	Spring assisted
Closing Action	Gravity
Maximum Velocity	1500 fpm
Maximum Back Pressure	2 in. w.g.
Typical Start-Open Pressure	Approximately 0.01 in. w.g.; size dependent
Customization	Available for the intended duct dimensions and exhaust arrangement.

Applications

Roof exhaust connections
Upward discharge branches

Solutions for Your Application

Outdoor air can descend through a stopped exhaust fan.

Gravity closes the blades when upward discharge ceases.

A horizontal damper may resist initial opening.

The spring-assisted configuration helps initiate blade lift in the intended direction.

Available Options

Duct opening dimensions
Installation frame dimensions

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