|Item||Nom. Size (Inch)||Size (mm)||Vent Size (mm)||Weight (kg)||Air Flow (mm2)||Plate Thickness (mm)||Reverse Depth (mm)|
|HM3||9 x 3||225 x 75||8 x 55||0.8||4500||4||30|
British Products Made in British Foundries
HM3 Air Brick
9 x 3 Hit and Miss Air Brick in a bare finish.
A very popular item and our only adjustable vent in this size. We regularly export this air brick to numerous countries, particularly USA, Canada and colder northern countries including a Swedish lighthouse and properties in Denmark and Norway were the ability to close off the air is especially useful.
Product specifications can be found in the table below.
Hit & Miss Air Bricks
Victorian reproduction adjustable ventilation grilles in cast iron - either open or closed, hence the name "hit and miss". Ideally suited to replace one for one with existing grilles.
These new reproductions are supplied in bare metal, and like the originals are not suitable for painting. They should be preserved with wd40 to prevent them seizing up. To ensure they do not seize, the clearances on these grilles are loose and therefore will not completely shut off the air flow when closed , this is in keeping with the original design and is unavoidable with cast iron grilles.
These are often used for general ventilation or for open fire and inglenook fire vents. Adjustable vent grilles may not be suitable for installing in every situation and we would recommend taking some advice from a qualified plumber if they are installed where they are to provide air for a heating appliance especially gas or oil fired.
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