FAQ Knowledge Articles

The rough opening (RO) size you need will depend on the shape of the glass that is to be fit into the frame. Rectangular glass will be able to use the formulas below to find the proper dimensions of your direct glaze unit. Round Top shapes RT2 and RT6 from the round top shape table will be able to use the formulas below to find the proper size. Visit your local Marvin Dealer to determine sizing for other round top shapes, polygons, or other rectangles. If you have an original order number, please have it accessible.

Please refer to the conversion factors below to determine your glass size based on the parameters; Clad or Wood, RO and shape referenced above.

Clad
Rectangle
RO Width = (Glass Size) + 3 9/16”
RO Height = (Glass Size) + 3 1/16”
Round Top
RO Width = (Glass Size) + 2 ¾”
RO Height = (Glass Size) + 2 ¼”

Wood (RO includes the standard subsill)
Rectangle
                RO Width = (Glass Size) + 3 9/16”
                RO Height = (Glass Size) + 4”

Round Top
                RO Width = (Glass Size) + 2 3/4”
                RO Height = (Glass Size) + 3 3/16”
 
Does not apply to Integrity or Infinity products.