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Frequently Asked Questions (FAQ)
Chimneys - Prefab

Dura Black

Q: Can I seal the slip connector if it fits loose?
A: Yes, but it is not necessary.

Q: How do I connect to the wall thimble or support box?
A: Connect with the slip connector or snap lock adapter.

Q: Are the elbows adjustable?
A: No; they are fixed at 45 and 90.

Q: What is the clearance to combustibles?
A: Clearance to combustibles is 18" for single wall.

Q: Is a tee cap included with the cap?
A: Yes.

Q: Can I paint it?
A: Yes. The Simpson Dura-Vent Engineering Dept. recommends Krylon BBQ & Stove paint (color: BBQ Black 1618).

Q: What gauge is the pipe?
A: 24 gauge (or .018" thick cold rolled steel).

Q: Can I cut the pipe?
A: No. Use adjustable pipe lengths rather than cutting pipe.

Q: Is the position of the male end up or down?
A: The male end is down; follow arrows on the pipe.

DVL Close Clearance Connector

Q: Is a stove top adapter required?
A: No; not always.

Q: What is the clearance to combustibles?
A: 6" clearance to walls, 8" clearance to ceiling.

Q: Is it HUD approved for use in mobile homes?
A: Yes.

Q: How can I reduce my clearance from 6"?
A: You can't.

Q: Can I paint it?
A: Yes. The Simpson Dura-Vent Engineering Dept. recommends Krylon BBQ & Stove paint (color: BBQ Black 1618).

Q: Is the close clearance adapter required?
A: Yes. It is used to connect to the support box or wall thimble. It also supports the pipe.

Dura Tech Chimney

Q: What is the clearance to combustibles to DuraTech Pipe?
A: Clearance to combustibles are 2” minimum.

Q: What is DuraTech made out of?
A: The inner wall is 430 stainless steel.
      The outer wall is 430 stainless steel.
      The outer wall can also be galvanized.

Q: How much pipe will the support box hold?
A: The square support and the flat support box will hold up to 60’ of pipe.  The round support box will hold up to 40’ of pipe.

Q: Do I have to frame around the support box?
A: Yes. All 4 sides need to be framed.

Q: Are you required to use a locking band for the joints of DuraTech pipe?
A: No. Locking bands are optional for DuraTech.

Q: Can I put screws in the joints of DuraTech pipe?
A: Yes. Screws are optional.

Q: Do I need to use a wall thimble when going through a concrete wall?
A: Yes. DuraTech requires a wall thimble whenever passing thru a wall.

Q: What is the longest piece of DuraTech pipe I can use through a wall thimble?
A: The maximum length of pipe thru a wall thimble is 2’.

Q: How far into the room does the DuraTech Pipe need to extend when going through a wall thimble?
A: 6” minimum into the room.

Q: Can I attach DuraTech directly to a free standing wood stove?
A: No.  Use stove pipe from the stove then transition to DuraTech.

Q: What seals the pipe as it passes through the wall thimble?
A: RTV, 500 degree F. or higher. Caulk the pipe to the thimble.

Q: How much pipe will a DuraTech tee support hold?
A: The DuraTech tee support will hold up to 60’ of pipe.

Q: Does the tee support go below or above the tee?
A: You can install the tee support above or below the DuraTech tee.

Q: Where would I find the information about framing the thimble or support box?
A: The Framing dimensions are in the DuraTech installation instructions Table 2. 

Q: What do I do when coming to an overhang or eave above?
A: There are 3 options to choose from;
        a) Penetrate the overhang.
        b) Box out the overhang.
        c) Offset the pipe with 30 or 15 degree elbows to go around overhang or eave.

Q: Can I add more than one elbow together to make an angle greater than 30?
A: No. You can only use sets of the same elbows. The maximum Offset is 30 degrees.

Q: How many offsets can I have?
A: DuraTech can have 2 offsets.

Q: What is the longest offset allowed with DuraTech pipe?
 A: Not more then 72” 2 sections max.

Q: How many elbow straps do I need for an offset?
A: If the total length of chimney sections between the (2) elbows is greater then 3 Feet, install a second elbow strap around the center of the chimney section.

Q: Can I offset directly on top of a support box?
A: No.  You must use a piece of pipe in the support box. Then you can start your offset.

Q: What adaptor should I use for a zero clearance fireplace?
A: The anchor plate.

Q: Can I offset directly on top of an anchor plate?
A: Yes.

Q: What is used to secure the transition anchor plate to the masonry chimney?
A: 1000 degree F. stove cement as a gasket material.  Use mechanical fasteners to secure transition anchor plate to masonry chimney.

Q: What is the height requirement for a factory built chimney?
A: 3’ minimum above the roof penetration and 2’ taller then any thing within 10’.

Q: At what intervals are wall straps required?
A:
Secure the chimney with wall straps at a minimum of 8’ intervals.

Q: When do you need an extended roof bracket?
A: When the chimney extends more then 5’ above the last wall strap or flashing.

Q: Is a Simpson DuraVent manufactured cap mandatory?
A: Yes.  In order to have an approved UL system you must use the DuraVent  cap.

Q: Can I paint the pipe?
A: Yes.  Prep pipe before painting.

Q: Does DuraVent make adjustable lengths?
A: No.  DuraTech comes in fixed lengths only.

Q: I have a wood stove with a prefab chimney that runs straight up, (no bends). My brothers have run regular stove pipe (single wall) straight through to the top leaving a 1" gap all around. My question is: How safe is this? I've heard that pre fab chimneys rust out after a few years.
A: Your brother has run single wall stove pipe out of his house. He is in for a house fire. The pipe requires 18" clearance to wood and can be used indoors only. Warn him before disaster strikes. Prefab chimneys do not have a problem with rusting out. The brand we carry, DuraVent has a 25 year warranty.

Q: The house we're planning to build will have an unfinished, unheated walk-out basement. My husband would like to have the option of installing a small wood stove in the future to make the space more comfortable during our short heating season (east-central Alabama). Is it possible to vent such a stove (safely) by running the vent pipe through a hole in the brick wall? The house will be brick veneer and will have a wood-burning fireplace on the main floor. The guy drawing our plans says venting the stove through a separate flue in the fireplace chimney is easy, but he'll have to make the chimney 2 feet wider to accommodate the stove flue (it's already 6 feet wide).
A: Yes. A chimney (metal class "A" or brick) is required. You cannot run single wall stove pipe on the outside of your house. The wood stove flue, if 6" inside diameter is 10" outside diameter. If a larger stove that requires 8" inside diameter, the outside diameter would be 12". Adding two feet is not necessary. The pipe only requires 2" clearance to combustibles. Since one side would be the fireplace box (non combustible). Then only 12" would be needed if 6" or 14" if 8". Be sure to follow the wood stove and chimney manufacturers instructions.

Q: I am interested in installing the DuraVent through-the-wall kit for a wood stove on my two story home. Since I have to run the chimney on the outside of the house will there be a problem with the chimney getting too cold and thereby not drafting properly? Does a DuraVent chimney need to be enclosed and insulated for the wood stove to work properly?
A: The DuraVent chimney is designed to be installed on the outside of a house without a chase. In other words, it does not need to be enclosed or insulated.

 

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