SELKIRK Corp 106400 Support Assembly, 6-Inch Product Description 6", 6RV-GVS, Support Assembly, Round, Type B, Gas Vent. Support Plate should be installed above the joist. Support plate also serves as a firestop. Will support a maximum of 60' of gas vent. The RV line of MetalBest round Type B gas vent pipe and fittings is designed for use on approved gas appliances in residential and light commercial and industrial applications. From the Manufacturer 6", 6RV-GVS, Support Assembly, Round, Type B, Gas Vent. Support Plate should be installed above the joist. Support plate also serves as a firestop. Will support a maximum of 60' of gas vent. The RV line of MetalBest round Type B gas vent pipe and fittings is designed for use on approved gas appliances in residential and light commercial and industrial applications. Features 6", 6RV-GVS, Support Assembly, Round, Type B, Gas Vent Support Plate should be installed above the joist Support plate also serves as a firestop Will support a maximum of 60' of gas vent RV line of MetalBest round Type B gas vent pipe and fittings is designed for use on approved gas appliances USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.