Designed to keep vent risers safe and secure, PEMCO’s vent riser frame simplifies your installation while giving it a more professional look. Constructed of a 4″ x 4″ square steel tubing, the risers are secured to the frame with two pre-formed unistrut brackets per riser (specify 2″ or 3″ pipe) which are provided with the frame. The entire frame is prime coated. The frame stands 16 feet high and is available in widths of 16″ for a single riser, 24″ for two risers, 32″ for three risers and 40″ for four risers. (Other sizes are available on request).