Cavity Telescopic Wall Sleeve comes with 3 Cast Iron Air Bricks with choice of finishes, bare as standard or painted black (+£30)
The air bricks are normally used externally and are the Windsor style which interconnect and clip into the cavity wall sleeve. We recommend using a drilled 9×9 inch Heritage vent, item HER9 on internal walls, either with or without copper flyscreen mesh.
If the wall thickness is more than 400mm then additional cavity wall sleeves are required and these are available item CAVHEXT9
Product specifications can be found in the table below.
3 8.5 x 8 13500 Item HER9 220 x 207
No. of air bricks supplied
Nom. External size (inch)
max airflow (mm2)
Ducting Dimensions (mm)
8.5 x 8
220 x 207, extends 250-404
Periscope vents are used in block and beam installations and for sub floor ventilation in timber floors. They have a cast iron air brick fitted externally and an integral internal plastic grille.
Cavity wall sleeves allow air into rooms for ventilation. They are fitted with internal baffles to reduce light and draughts. They are supplied with 1,2 or 3 cast iron air bricks externally depending on size and require an additional cast iron vent grille for the room they ventilate. We would recommend using Daisy pattern (DAY104 and DAY107) grilles with mesh for the CAV3 and CAV6 respectively and the Heritage 9x9 grille for the CAV9.
The Windsor cast iron air brick fits into the modern plastic ducting and although available in just one size, the Windsor is an interlocking air brick that can be doubled or tripled to fit the larger sleeves and make a larger vent.
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The Cast Iron Air Brick Company supply cast air bricks and a huge range of ventilation grilles and gratings to individuals and the trade. Our items are used to replace existing defective cast iron ware and are more commonly used in new builds.
former customers properties including Queens residence at Buckingham Palace, prime ministers home at Chequers, Oxford and Cambridge universities and new builds including London 2012 Olympics.
We are able to supply just one air brick and can also supply architects and developers with large quantities.