ATG Intumescent Air Transfer Grilles

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 partitions for up to 60 minutes.

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40 years of experience

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


There are no published standards for these components but Quelfire 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.


The Quelfire 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.


Quelfire 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.

Application / Installation

Quelfire 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 Quelfire 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).

Technical Support & Guidance

Should you require any further information regarding this product, please don’t hesitate to contact one of our specialists.


Product CodeDimensions (mm)Fire RatingFree Air Flow
ATG150/150150 x 150 x 4060 minutes125cm²
ATG200/200200 x 200 x 4060 minutes233cm²
ATG250/250250 x 250 x 4060 minutes383cm²
ATG300/300300 x 300 x 4060 minutes542cm²
ATG350/350350 x 350 x 4060 minutes756cm²
ATG400/400400 x 400 x 4060 minutes977cm²
ATG450/450450 x 450 x 4060 minutes1288cm²
ATG500/500500 x 500 x 4060 minutes1554cm²
ATG600/600600 x 600 x 4060 minutes2278cm²
Cover Plates
CP150/150to suit ATG150/150NA152cm²
CP200/200to suit ATG200/200NA262cm²
CP250/250to suit ATG250/250NA424cm²
CP300/300to suit ATG300/300NA626cm²
CP350/350to suit ATG350/350NA320cm²
CP400/400to suit ATG400/400NA1031cm²
CP450/450to suit ATG450/450NA1422cm²
CP500/500to suit ATG500/500NA1726cm²
CP600/600to suit ATG600/600NA2539cm²