![Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons](https://www.gjohns.co.uk/media/catalog/product/cache/90cf8aa233bbe36808439b7738134432/i/n/intumescent-fire-rated-air-transfer-grille-diagram.gif)
Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons
![Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons](https://www.gjohns.co.uk/media/catalog/product/cache/90cf8aa233bbe36808439b7738134432/f/i/fire-rated-intumescent-air-transfer-grille-vents-for-fire-doors.webp)
Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons
![Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons](https://www.gjohns.co.uk/media/wysiwyg/Diagrams/Intumescent-Fire-Rated-Air-Transfer-Grille-Diagram.gif)
Intumescent Air Transfer Grilles - Fire Rated Vents - For 30 & 60 Minute Fire Doors | G Johns & Sons
![Intumescent Air Transfer Grille |Air Transfer Grilles provide protection against the spread of fire through walls, doors, air ducts and openings in fire-resisting constructions such as partitions and doors. Intumescent Air Transfer Grille |Air Transfer Grilles provide protection against the spread of fire through walls, doors, air ducts and openings in fire-resisting constructions such as partitions and doors.](https://sites.create-cdn.net/siteimages/26/2/6/262696/19/3/4/19342829/600x600.jpg?1620658449)