Intumescent Air Transfer Grille for Air Ducts and Openings

Intumescent Air Transfer Grille | ATG

A comprehensive range of Intumescent Air Transfer Grille Systems that are suitable for providing protection against the spread of fire through air ducts and openings in fire-resisting constructions such as doors and walls for up to 60 minutes.

Name: Air Transfer Grille (ATG)


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Features & Benefits

  • Tested to BS 476: Pts 20 & 22
  • Up to 60 minutes fire rating
  • Available in many different sizes
  • Suitable for use in air ducts
  • Easy to install and maintenance free

Product Information


The ATG Intumescent Air Transfer Grilles are made from a rectangular extrusion of UPVC filled with an intumescent core. Circular grilles are contained with a rim of aluminium. In the event of fire the effect of heat causes the intumescent core to expand, sealing off the duct or opening against the passage of flames and hot gases.


ATG Intumescent Air Transfer Grilles are expected to last the lifetime of the service installation. The Intumescent material is susceptible to damage from prolonged contact with water. The Grilles can be cleaned if required by wiping over with a damp cloth.

Standards & Approvals

There are no published standards for these components but the ATG Intumescent Air Transfer Grilles have been tested by Warrington Fire Research Centre according to BS 476 Parts 20 & 22: 1987. Tests show that a 600 x 600mm can provide fire resistance of up to 60 minutes.

Performance Table


Product Code Dimensions (mm) Fire Rating Free Air Flow
ATG150/150 150 x 150 x 40 60 minutes 125.7 cm²
ATG200/200 200 x 200 x 40 60 minutes 233 cm²
ATG250/250 250 x 250 x 40 60 minutes 383 cm²
ATG300/300 300 x 300 x 40 60 minutes 542 cm²
ATG350/350 350 x 350 x 40 60 minutes 756 cm²
ATG400/400 400 x 400 x 40 60 minutes 977 cm²
ATG450/450 450 x 450 x 40 60 minutes 1,288 cm²
ATG500/500 500 x 500 x 40 60 minutes 1,554 cm²
ATG600/600 600 x 600 x 40 60 minutes 2,278 cm²

Cover Plates

Product Code Dimensions (mm) Fire Rating Free Air Flow
CP150/150 to suit ATG150/150 n/a 152 cm²
CP200/200 to suit ATG200/200 n/a 262 cm²
CP250/250 to suit ATG250/250 n/a 424 cm²
CP300/300 to suit ATG300/300 n/a 626 cm²
CP350/350 to suit ATG350/350 n/a 808 cm²
CP400/400 to suit ATG400/400 n/a 1,031 cm²
CP450/450 to suit ATG450/450 n/a 1,422 cm²
CP500/500 to suit ATG500/500 n/a 1,726 cm²
CP600/600 to suit ATG600/600 n/a 2,539 cm²

Quelfire can manufacture grilles in any size between 100x100mm and 600x600mm in 25mm increments.

Installation Information

ATG Air Transfer Grilles are designed to fit neatly into rectangular or square ducts and openings. They can be secured in several ways depending upon the surrounding construction and the required appearance.

When a metal duct passes through a fire barrier wall the ATG Air Transfer Grille should be secured in the duct on the centre line of the fire barrier. It may be secured in position by angle cleats secured to the duct top and bottom or by screws projecting through the duct walls to either side of the grille (see figure 1). If the screw heads are left projecting they will form a key to the pointing between duct and fire barrier wall which should be in Quelfire QF2 Compound (see separate Product Datasheet).

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ATG Intumescent Air Transfer Grilles - Technical Documentation