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HM9 Air Brick


9 x 9 Hit and Miss Air Brick in a bare oiled finish adjustable to open or close positions. Constructed of a 9×9 inch cast iron body with single cast iron slotted plate behind, held in place by screw and chromed metal adjusting knob. The screw is fastened at the back and held in place either by a nut or ball peened.

An existing property where the HM9 is already installed is the well known Eton college in Berkshire, England.

This imperial air brick can be used with  duct tape to use with the metric plastic Rytons ducting for cavity wall sleeves item CAVHEXT9 which is available separately on this website.

It is supplied oiled and therefore not suited to painting as paint would restrict the movement of the grille. Seek specialist advice if it is going to be used to supply air for combustion, ie open fires, boilers, log burners as it may not meet current regulations for this purpose.