Although we have cast iron slotted air bricks in metric sizes to perfectly engage with modern plastic ducting and periscopes, there may come a time when the installation requires imperial old patterned cast iron air bricks. Connecting these can be especially difficult which is why we've introduced these aluminium sleeves known as the metimp adapators (short for metric imperial). They are available in two sizes, single air brick size to connect up to a periscope duct and cavity wall sleeve or the double brick size for connecting to a larger wall sleeve
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