Excel Direct, Square Support/Radiation Shield, 4"

EXCELDirect supports are suitable for use on flat or sloping ceilings.  The amount they project into the room is determined only by the desired visual effect, but must be more than 1/4".  These supports are designed to act as a combination of support and attic radiation shield.  To use either support as an attic radiation shield, simply close the open area at the top of the support (in the attic) with a storm collar.  The Round & Square Supports can hold up to 50' of 4" x 6-5/8" venting or 40' of 5" x 8".