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Direct Vent Pipe

Direct vent pipe is a venting option that uses a coaxial system (a small pipe within a larger pipe) to both vent exhaust gases and draw air from outside the home to aid combustion. Direct vent pipe offers very high efficiency and is great for newer, air-tight homes. Consult a qualified installer, and if direct vent pipe is what you need, you'll be sure to find the perfect pipe for your installation here in our direct vent pipe store.
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By Phil Fraser from Reading, PA on November 5, 2012
I have a propane forced air heater from a mobile home that I would like to install in my garage. I need to run a chimney pipe out of my roof. The roof is not insulated and it is a direct shot right to the roof, no ceilings to go through or anything like that, so I can run a direct pipe up through my roof.

What do I need as far as a roof thimble and other parts to make the transition through the roof?
By Collin C. - NFI Master Hearth Professional on November 6, 2012

Answer:
Generally, you would only require a fire stop, roof flashing, storm collar, and cap to make the penetration through the roof. However, this will depend on the type of heater. Most forced air heaters will use B vent piping between 3 and 6 inches in diameter.

By Brandon from Birmingham, AL on December 13, 2012
I have a gas ventless fireplace that measures 39" across the front. There is a cantilevered chase but it does not extend to the roof line. It is effectively useless because whenever you fire it up, it fills the house with stink. I want to replace it with something vented. What are my options?
By Tyler M. - Fireplace Specialist on December 14, 2012

Answer:
If you have a full-bodied zero clearance vent-free fireplace, you can remove it and install a direct vent zero clearance fireplace. Please see our selection here: Direct Vent Fireplaces

Most of these fireplaces can be vented and terminated horizontally (some straight out the back). For more information, please see our Gas Fireplace and Stove Buying Guide.


By James Burbidge from Bancroft, Ontario on November 28, 2012
I need to bend a 4x7 coaxial flexible aluminum direct vent pipe into a 90 degree elbow. I am concerned about kinking the pipe and about maintaining the correct clearance between the pipes as I make the bend(s). What is the best technique for creating a good elbow?
By Collin C. - NFI Master Hearth Professional on November 28, 2012

Answer:
The best way to accomplish a clean bend in the pipe would be to use a piece of 4- or 5-inch diameter PVC piping to form the bend around. I recommend using a pair of clamps to hold the inner pipe against the side of the outer pipe. You can then work that side of the outer pipe around the piece of PVC gently, until you have the desired bend. Remove the clamps and reinstall any provided spacers.

By Dan from Denver, CO on April 8, 2013
I'm replacing an old insert with a new Kozy unit. the old unit exhaust exited out of the top of the unit into a double wall pipe that went up two stories. The combustion air supply is a 3" flex that pulled from a different source. Is there an adapter that will fit into the new unit and allows for the exhaust pipe to go in one direction, while the combustion air is piped in from another pipe?
By Collin C. - NFI Master Hearth Professional on April 9, 2013

Answer:
I am not aware of such an adapter that is currently being made. Usually, direct vent piping uses a colinear pipe, with the outer pipe drawing fresh air into the unit for combustion. Units that do not have this sort of setup will usually use a separate 3 inch or 4 inch duct that draws air from another source, similar to what you have now. The new unit may have a similar provision.

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