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Hi, The actual requirement of free air has been calculated at 113cm2, this was the nearest vent in free air capacity that I could get, no, there is no other vent or air brick, above floor level in the room. We always have the window open slightly so have a constant flow of air. H

Hi, On the advice of my gas fitter just purchased a BM420/1 Air Ventilator 129cm2. My question, I know this is the right size of free air that we need for the appliance, but the size of the actual space within the vent will create a massive draft without some kind of baffle being fitted. Do...