The Builders Edge 6" Hooded Vent comes complete with 7 in. aluminum tube (6 in. diameter); Net free area: 25 sq in . Mounting blocks are durable, maintenance-free, U. V. stabilized and constructed with color molded-through so they won't scratch, flake, or fade. Our patented Snap-On Trim Ring makes installation easy. Available in 24 colors to match your siding manufacturer and a Paintable option to easily match your home. Limited lifetime . Proudly made in the USA! .