5 Type B Gas Vent 45 to 60 Degree Adjustable Elbow from the RV Collection When creating an offset in the vent pipe system calculate the offset to determine the elbow angle. This elbow length creates a 45 degrees to 60 degrees bend. When used with a corresponding elbow the system will continue vertically toward the ceiling with the appropriate offset. Add pipe sections between pairs to produce additional offset. The elbow has 3 adjustable pieces that twist for easy accurate offsets. The RV series offers round gas vent pipe and fittings for residential commercial and industrial applications. It features a snap together non-positional lock system die formed ends and eliminates the need for all cutting fitting and special engineering. It has an improved joint design provides for a rapid and secure connection in seconds. The use of our LockTab feature gives installers the option of engaging this tab instead of using sheet metal screws when required by local code. Features: Residential and light commercial and industrial Materials: Galvanized steel outer and aluminum inner liner Easy to use LockTab or non-positional lock system Fuel: Gas UL 441 listed Minimum Safety Clearance to Combustibles: 1 for diameters of 3 to 24 2 for diameters 26 to 48 Warranty: Lifetime Limited Warranty