Furnace vent pipe too close to combustibles. Metal vents that are too close to wood or combustionable materials may cause the wood to burst into flames. Here’s a guide: Table of Type B-Vent Rooftop Clearance Requirements. Therefore, insulation, including fiberglass, should be a couple inches away from a B-vent to eliminate the hazard of a fire. Does Type B Gas Vent have a fire rating? All locking joints are to be securely snap-locked together. A B-vent is the metal duct that is normally used to vent gas and propane appliances such as furnaces and water heaters. They are: 1. flue-gas temperature 2. heat loss in the vent 3. vent height 4. vent system capacity 5. restrictions to flow and 6. the ambient temperature. The B vent is on the lower roof, 3 feet away and at least 2 feet below the other roof. Furnace B-vent clearance from window. This one-inch is a typical clearance for all brands of Type B Vent, but each section of vent pipe is marked with the clearance required by Underwriter Laboratories, so it should be checked. This is an area where I slide on the requirements - I don't report on it. But then I already knew that. vent system. The B vent is in contact with the loose fill insulation. Single wall vents should have a minimum of 6 inches of clearance and double wall, sometimes called a “B” vent, should have 1 inch minimum clearance. The manufacture even stamps this into the vent. NOTICE: Read these instruc- A proper vent with insulation baffle looks more like this: Insulation baffle around a B-Vent pipe in an attic Inspecting HVAC Systems. When installed as a Type B Gas Vent, a minimum of one (1) inch airspace clearance to combustible material is required. WARNING: Vent pipe air space clearances to combus-tibles are 1"4000 on all sides except on the horizontal sections , which require 2" clearances from the top of the pipe. The minimum requirements for vent ducting are: Single wall, welded seam 18 gauge ducting or Class-A Double Wall Positive Pressure Grease Vent Ducting. The problem with this is that the single wall pipe requires even greater clearances (6″). Diedrich Manufacturing, Inc. recommends UL certified (CE for European Union) Class-A Positive Pressure Ducting due to its superiority over the Single Wall welded seam 18-gauge ducting. Factors Affecting Vent System Design and Operation There are many variables dictating how well a vent system will operate. ... B vent clearance; If this is your first visit, be sure to check out the FAQ. The 1992 Vent Sizing Tables require that all Type B gas vents terminate above the roof with a listed cap or listed roof assembly in accordance with the manufacturer’s instructions. Clearance Requirements from Vent Terminations to Building Openings for SV Models * All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code, ANSI Z223.1 and in Canada, in accordance with NSCNGPIC. Durability is the result of high-quality materials and workmanship, with galvanized outer pipe and aluminum inner pipe providing protection against corrosion and external damage. I know about the 1 inch rule. These vents can achieve temperatures of 300 degrees when gas appliances are operating. Type B Gas Vent is designed for negative pressure applications and flue gas temperatures not exceeding 400°F above ambient for Category I appliances. Type B Gas Vent requires a minimum of one-inch clearance to combustibles. Specific Inspection Topics. For Type B 2x4 and BW Vents see Section 2, page 10 for clearance to combustibles. 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