A full range of models from small residential to large commercial capacities. All models feature the UC1 interlock control, factory set Fan Proving Switch and adjustable damper to fine tune vent system draft. Can be used on natural gas, LP and oilfired furnaces, boilers and water heaters. We recommend using the SideShot vent systems for oil fired applications and do not recommend using the models HS3, 4, 5 for oil due to the potential volume of soot if the burner goes out of adjustment. Select the appropriately sized VH1-Series Vent Hood to complete your side wall vent system.