Some online resources that provide installation guides or manual for gas vent pipes are AmeriVent, VentingPipe and Metal-Fab Inc. These companies offer different types and brands of venting pipes, including DuraVent and MetalBest B gas vent systems.
At the AmeriVent site, there are round and oval type B gas vent pipes and fitting in a variety of pipe diameter sizes. This site also provides installation instructions for these types of gas vent pipes. Additionally, AmeriVent offers other venting products, including direct and pellet stove vents.
The VentingPipe site also has B class gas vent pipes for different brands, including DuraVent, HeatFab and MetalBest venting systems. The Metal-Fab Inc. site also has instructions for these types of vent pipes. Two different sets of instructions are available for pipe diameter sizes the range from 3 to 14 inches and from 16 to 30 inches. Other installation guide resources include Hart & Cooley and Gorman Industries Inc.