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Customer Q&A with Product Specialists

Phil from Mill Valley, Ca asked:
How do I connect a single wall flue vent pipe from my water heater to a Type B (double-walled) vent pipe, which passes through a steel fire stop plate and my garage wall to connect with an external single wall flue vent pipe that goes up the side of my ho
How do I connect a single wall flue vent pipe from my water heater to a Type B (double-walled) vent pipe, which passes through a steel fire stop plate and my garage wall to connect with an external single wall flue vent pipe that goes up the side of my ho
Most appliances such as your water heater require a continuous connection of double-wall type B gas vent from the unit's flue collar to the termination. Please consult your installation manual for reference.
Answered by: Tyler M. - NFI Master Hearth Professional

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Philip C. from Brick, NJ 08723 asked:
I have a customer with a Lennox-MPD4540CNM-B fireplace that currently terminates horizontally through the rear. The customer needs to raise the termination cap as it exits onto a walkway. They would like to cap the rear exhaust port, open the top port, add 12 inches of vertical pipe, a 90-degree elbow, and approximately 30 inches of horizontal pipe to the termination cap. The wall has not yet been opened, and we assume the fireplace has both rear and top openings. Please advise on: 1. If this configuration is possible. 2. What specific parts are required. 3. If these parts can be supplied. I recall a similar installation with a Superior unit previously.
I have a customer with a Lennox-MPD4540CNM-B fireplace that currently terminates horizontally through the rear. The customer needs to raise the termination cap as it exits onto a walkway. They would like to cap the rear exhaust port, open the top port, add 12 inches of vertical pipe, a 90-degree elbow, and approximately 30 inches of horizontal pipe to the termination cap. The wall has not yet been opened, and we assume the fireplace has both rear and top openings. Please advise on: 1. If this configuration is possible. 2. What specific parts are required. 3. If these parts can be supplied. I recall a similar installation with a Superior unit previously.
As this is not a current model, we cannot provide specific advice on the proper venting components for it. For more information, please contact IHP, the company that now manages all old Lennox parts, at 866-328-4537.
Answered by: Tyler M. on Mar 30, 2026

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Barb from Southern Maryland asked:
Do you sell an adapter to connect Duravent double wall stove pipe to single wall pipe ?
Do you sell an adapter to connect Duravent double wall stove pipe to single wall pipe ?
No, if you are using the DuraVent DVL double-wall black stovepipe, that pipe is not intended to be combined with single-wall pipe.
Answered by: Tyler M. - NFI Master Hearth Professional

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Leonard H. from Kennewick, WA asked:
I currently have a Blaze King wood stove venting up through an 8" triple wall pipe that contains a 12' dogleg in the attic. I would like to convert it to a pellet stove that has a 3" exhaust pipe. Should I get an adapter at the ceiling that goes from 3 to
I currently have a Blaze King wood stove venting up through an 8" triple wall pipe that contains a 12' dogleg in the attic. I would like to convert it to a pellet stove that has a 3" exhaust pipe. Should I get an adapter at the ceiling that goes from 3 to
You will need to consult the installation manual for the pellet stove that you are looking to replace your wood-burning stove with.  The venting requirements differ for every appliance and will be found in the installation manual.
Answered by: Aaron D.

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