Extruded baffles are made with recycled polystyrene and contain no CFC inert organic materials. The 22" wide x 48" long baffles are designed to fit 24" O/C rafters and are easily adaptable for 16" O/C rafters. For continuous baffle needs for cathedral ceilings, both "E" vents and "J" vents fit together and one 5/16" staple will go through both vents. Meets HUD, FHA, NFPA 255, ASTM E-84-91AA, UBC24-1 and UL 17231.