I have a potterton suprima 30 boiler in a kitchen cupboard (on an outside wall). I've been told it needs vents high and low of 99cm2 each. [b]But what does this mean? [/b] I don't have a clue what size vents I need to buy or where I can get them from! I've looked in a couple of DIY shops and none of the vents seem to match this 99cm2 size! Thanks[/b]
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