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Grid9 Air Brick


A very versatile large 9×9 inch air brick used along with the single sized GRID3 and double sized GRID6 as the original vent in millions of late Victorian properties. Very common in period English mansions, halls and stately homes as well commercial and industrial Victorian propertiess. Relatively small hole size eliminates rodent access at the expense of a lower than average free area.

9 x 9 Square Hole Air Brick with choice of finishes, bare or painted black. Use bare metal to allow to rust for a natural finish commensurate with red brick buildings or for customers to paint to their own paint scheme or purchase painted black for use in non-red brick properties or rendered properties.

Painted vents use two part epoxy black gloss top coat which is hard wearing but is just a decorative finish, like all painted cast iron products it will require repainting from time to time, especially if situated on an exposed wall. Repainting can be frequent if the grille is positioned in the sunlight, or chipped or exposed to salt air . The gloss paint will dull over time, in exposed conditions it is likely to dull to a satin sheen fairly quickly. Regardless of the paint finish the cast iron grille will last for many decades with or without painting.

For company orders we can supply air bricks in any RAL colour, professionally primed with 3 part epoxy 2 part gloss or matt top coat at an additional cost of £200+vat- please email item number, quantity and RAL number for a proforma for this.

This imperial air brick can be used with duct tape (there is no METIMP adapter therefore the fitting requires some degree of patience) the metric plastic Rytons ducting for cavity wall sleeves available seperately on this website item CAVHEXT9

It isn’t possible to install flymesh at the back of this air brick as the mesh will either become dislodged or will block without the ability to clean it. If flies, wasps and bugs are gaining entrance to the property via the vents and are a nuisance the FLY9 cast iron air brick with removable front and integral mesh may be a more suitable alternative. Please note mesh cannot legally be used (UK – current GAS Safe and HETAS regulations apply) vents where the vents are required to feed a combustion appliance or the room where there is a combustion appliance.

Although not as efficient as the MAX9 cast iron air brick, the GRID9 is especially suited to period properties requiring a little less ventilation. It has been used in National Trust properties and most noticeably in the National Monument of Nelsons flagship, HMS Victory

Product specifications can be found in the table below.