We've been given an extractor [vented to outside wall] hood. Outside diameter [top of hood] is 6 inches across. Does it matter if we go for a round hose or a flat trunking. Can you get a 6" to flat adaptor? Thanks
the white plastic bit is a one-way valve/flap, this sits inside a collar [coming through from the underside] that is 6 inches across. Hope that helps. Thanks