British Products Made in British Foundries

Restoration companies and architects using the cavity wall sleeves and periscope vents combined with Windsor cast iron air bricksDSCF3005DSCF3008Cavity wall sleeve for use with 9x3 air brick and DAY104PER3 (3)

PER3 Periscope Vent Duct and Windsor air brick

From: £70

Periscope Vent Duct comes with a telescopic sleeve and 1 Cast Iron Air Brick with choice of finishes, bare as standard or painted black (+£10)

Can be used with PERHEXT horizontal extension, PERVEXT vertical extension or PERRND round adapter. The PERRND adapter is especially useful used with 2 metre lengths of flexible ducting to transfer air flow in hard to reach areas over distance.

Product specifications can be found in the table below.

Clear selection

View the manufacturers specifications for Plastic Ducting

PER3 1 8.5 x 2.5 4500 N/A see sheet

Item No. of air bricks supplied Nom. External size (inch) max airflow (mm2) Recommended Grille Ducting Dimensions (mm)
PER3 1 8.5 x 2.5 4500 N/A See sheet