Square Intumescent Air Transfer Fire Block - 350mm

The 350mm Square Intumescent Air Transfer Fire Block is a high-performance air transfer grille for doors, walls and ducts that gives good airflow and quiet operation in normal use, then seals the aperture in a fire. It has no moving parts: the intumescent core expands in heat to form an incombustible mass that blocks the spread of fire and hot smoke.Slim at 38mm thick with roughly 60% free area, it is tested in timber doors rated up to 60 minutes and in walls and ductwork rated up to 120 minutes. Finished in black/grey, it needs little maintenance beyond an occasional wipe with a damp cloth.Each fire block is made to order, so please allow approximately one week for delivery. 350 x 350mm Intumescent fire block Up to 120 min in walls and ducts Suitable for Vertical and horizontal ducted ventilation systems Airflow control and fire protection Specifications Type Intumescent air transfer fire block Dimensions (H x W x D) 350mm x 350mm x 38mm Fire rating (timber doors) Up to 60 minutes Fire rating (walls and ducts) Up to 120 minutes Free area Approx. 60% Mounting Doors, walls, ducts Finish Black/grey (other colours on request) Lead time Made to order, approx. 1 week Warranty 1 Year Manufacturer