STJH-COMBINATION-FIRE-SMOKE-DAMPER-914X914-CLASS1

Combination Fire and Smoke Damper 914 x 914 mm Class I

A broad multi-blade fire-smoke assembly for main ventilation branches.

A single-section square opening suits substantial duct branches.
The expanded blade bank distributes closure across the full height.

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Product Introduction

The large square frame carries a longer bank of linked blades than the compact model. Perimeter and blade-edge sealing work with the external drive to close the main supply or return path at a combined barrier.

Key Features

A single-section square opening suits substantial duct branches.
The expanded blade bank distributes closure across the full height.

Technical Parameters

Opening Dimensions	914 x 914 mm
Construction	Galvanized steel frame
Blade Design	Formed 3V multi-blade
Drive Arrangement	External linked actuation
Smoke Leakage Configuration	Class I
Fire Configuration	1.5 hours
Velocity Limit	2000 fpm
Pressure Limit	4 in. w.g.
Temperature Configuration	350 °F (177 °C)
Customization	Available to suit the barrier construction and ventilation controls.

Applications

Main return penetrations between compartments
Clean manufacturing supply trunks

Solutions for Your Application

A large opening requires coordinated closure over many blades.

The linked drive moves the full blade bank as one assembly.

The frame could be distorted by the surrounding duct.

Use a sleeve and supports that preserve the square frame and blade clearances.

Available Options

Remote position switches
Electrical or pneumatic drive arrangement
Connecting sleeve

Planning a Combination Fire and Smoke Damper 914 x 914 mm Class I specification?

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

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