Clear Attic Furnace Flue

From masonry chimneys to any combustible material including insulation.

Clear attic furnace flue.

This will stop the air from getting a free ride along the chase and heating your attic. The vent should always be clear. You can reduce creosote buildup in your fireplace flue by providing adequate combustion air which will encourage a hot clean burning fire. The vertical flue at the ceiling level is surrounded by and attached to a horizontal piece of open 1 2 x 1 2 metal mesh screen about 10 square.

I try to always design in some slop in spacing around mechanical equipment. Of clearance from class b flues 2 in. How to check for creosote. Because the pipe gets hot building codes require 1 in.

The metal furnace flue extends vertically through the closet ceiling through the attic and roof. Now i do have experience with technology change versus construction framing. Furnace flues require special sealing techniques the opening around a furnace or water heater flue or chimney can be a major source of warm air moving in the attic. Not much furnace experience around here that s just a heating coil on the end of the a c blower used for 7 8 weeks a year g.

Remove the insulation between the joists where the flue is located to clear an area about 18 inches away from the flue on each side. Then use fire rated caulk to seal the gap btw the sheet metal and flue and then the sheet metal to the attic floor. Wipe it clear with a rag or soft cloth and then replace the cap. See direct vents side wall vents for a complete table of recommended clearance distances from a direct vent gas appliance terminal to other building components or features.

While you are at it look around for all other duct chases in your attic. To check for creosote yourself first make sure there s no downdraft from the chimney. 2015 irc m1305 recommends that the furnace have a level working space of at least 30 inches by 30 inches in the front of the appliance. American gas association has certified the design of condensing furnaces for a minimum of 0 clearance from combustible materials with a single wall plastic vent pipe.

Because the pipe gets hot building codes usually require 1 inch of clearance from metal flues 2 inches from masonry chimneys to any combustible material including insulation. Apply a thick bead of high temperature caulk the flue on one. Nail them both on the attic floor so they butt up against the flue.