When ordering use the Type Ref No. including the Diameter Code (TYPE ACC21 plus 20) shown on the chart in brackets. For example an ACC2120 would be a 250mm x 150mm door size to suit duct diameters 200/220.
Please note that the MIN/MAX dimensions quoted are the absolute diameter limits for use of this door coding.
Please Note: Type ACC54 500mm x 400mm will not be available until October 2007.