DuraVent

FAQs

DOWNLOAD PDF

1. What is the clearance for BW Oval?
Clearance is set by firestop 1/2” – 5/16”; 1” if out of wall space.

2. Can I put screws in Type B Gas Vent?
Yes, if desired, but DO NOT PUNCTURE INNER LINER!

3. Can Type B Gas Vent terminate horizontally on a wall?
No, only Cat III 1738 approved systems can terminate on a side wall.

4. What flashing do I use for pitches over 7/12?
Steep roof flashing.

5. Which support do I use: round or square support?
Usually, the square firestop support is used at the ceiling; the round bucket support may also be used if
transitioning to single wall pipe.

6. What is the inner liner made of?
.016” thick aluminum

7. Is Oval Type B Gas Vent UL listed in 2 x 4 wall?
Yes, 4” and 5” is approved centered in a 2×4 wall space; 6” is for 2×6 walls only.

8. Can I common vent 2 gas fireplaces?
No. Common vent tables only cover furnace or water heater common venting.

9. Is this L-Vent?
No, L-Vent needs stainless steel inner liner.

10. Can I use Type B Gas Vent on an oil furnace?
No. Oil requires stainless steel inner liner.

11. How often do I support the pipe?
Support about every 4 to 5’. Use wall strap or square firestop, or round bucket ceiling supports.

12. Is a draft hood connector needed?
Some water heaters require one; it is optional for furnaces or gas fireplaces.

13. What is the maximum temperature?
400° + AMB (room temperature)

14. Does horizontal venting require an upward pitch?
A 1/4 inch per foot minimum pitch is required to vent horizontally. Now downward dips or sags are allowed.

15. Is there a firestop plate?
Yes, it is called the Firestop Spacer, and is required at every floor/ceiling level penetrated.

16. How is masonry installation supported?
DuraFlex. termination supports weight of flex.

17. What is minimum termination height?
There is a 1’ minimum for up to 7/12 roof pitch. See Table 1 in the instructions if over 7/12.

18. Is the Male & Female Adapter UL Listed for use with other UL Listed Type B Gas Vents?
Yes. It is listed for use with most UL listed competitors Type B Gas Vents.

19. Does DuraVent® have a cone for masonry reline to pull through the chimney?
Yes: the flex puller. (See DuraFlex. section of catalog)

20. How do I size my appliance?For (2) or more appliances, use the sizing handbook or AGA Gama tables.

21. How do I order a reduction tee?
Specify main body and branch size to Customer Service.

22. What is the overlap of pipe?
You must deduct 1 1/2” overlap per connection or .” per end of pipe.

23. What flashing do I use for flat roof?
Tall cone flashing is for flat (0/12) roof pitch.

DOWNLOAD PDF

1. What is the clearance to combustibles for DirectVent® Pro?
Clearances on pipe are specified in the manufacturer’s installation instructions. Usually it’s a 1” clearance when running vertically but can vary from 1-3 inches above a horizontal run.

2. Do I need a wall thimble or is the wall thimble Cover okay?
The US usually only requires a decorative wall thimble Cover on interior side of wall. Check your appliance manual for required Thimbles, Firestops or other pass-thru components. In Canadian installations you need a 2-piece wall thimble to comply with Code.

3. Can I install the snorkel underground?
No, air must get to the base of the snorkel and proper drainage must occur below.

4. What type of silicone/sealant can I use?
Sealant is specified by the appliance manufacturer’s installation instructions, if required follow their instruction for type of sealants.

5. Can I interchange DirectVent® Pro (4 x 6 5/8”) with Heat-N-Glo Slimline (4 x 6 5/8”)?
Yes, the new DirectVent® Pro should fit older slim-line and GS venting system?

6. Can I use the Masonry Chimney Conversion kit in Canada?
No. The 4” flex conversion kit is not approved for Canada. Only a Co-Linear 3” twin flue system is permitted in masonry chimneys in Canada.

7. Do I need to use DuraFlex® pipe in the conversion kit?
Aluminum or Stainless flexible pipe may be used with our kits.

8. How many elbows can I have in my system?
2-3 elbows it typical but check the appliance manufacturer’s installation instructions for limitations on number of elbows or minimum height.

9. How is this pipe listed and tested?
System is listed and tested by maker of the direct vent appliance, and it is tested as a system with our venting.

10. What flashing can I use for steep roofs over 7/12 pitch?
Use steep roof flashing (Stock # 46DVA-F12 for 4 x 6 5/8”, 58DVA-F12 for 5 x 8”)

11. Do I use a vinyl siding standoff for the snorkel?
There is no snorkel vinyl siding standoff. It is not needed.

12. What do I use to go through a ceiling?
Use a cathedral ceiling support box or a round ceiling support.

13. How high above the roof line do I need to go?
1’ if under 7/12 pitch.

14. Can I use Type B Gas Vent or a Type B Gas Vent cap?
You must always use a Direct vent termination cap.

15. Should restrictor disk be used?
Only if specified by the appliance manufacturer.

16. How close to a wall can I terminate?
8’ unless a lesser distance is tested by appliance manufacturer.

17. How close to the eaves can I terminate?
Some systems require 12”-36” from a ventilated or non-ventilated eave or below the lowest part of eaves.

18. Can I paint it?
Yes. The DuraVent Engineering Dept. recommends Stove Bright Touch Up Paint, or any Hi-Temp stove paint.

19. Is the old DirectVent® GS series and the new DirectVent® Pro series compatible?
Yes. The old GS series and new Pro series are compatible except the Pro series pipe extension and round horizontal termination cap.

DOWNLOAD PDF

1. What is Connector pipe?
Connector pipe is used to attach from an appliance (stove) to an insulated chimney. It is also known as stove pipe. Connector pipe or stove pipe cannot be enclosed.

2. Can DuraBlack® be used as a connector pipe for wood stoves?
Yes. DuraBlack is a Connector Pipe for wood, oil, coal, or gas fuels.

3. Why does my new stovepipe smell?
Our high temp paint is heat cured during the first few burns on a new system. See the Instruction Manual stating to open windows and provide ventilation until stovepipe is heat cured.

4. How do I connect DuraBlack® to a DuraVent® Chimney system?
Installation information for DuraBlack to DuraVent Chimney systems can be found on the DuraVent website under the product category. Videos, as well as installation instructions, are available.

5. What adapter is used to connect DuraBlack® to another manufacturers chimney?
Use the stovepipe Adapter 6, 7, or 8DBK-ADSL (chimney) adapter (Finish Collar) provided from the manufacturer of the insulated chimney.

6. Is DuraBlack® a double wall connector pipe?
No. DuraBlack is a single wall connector pipe. DuraVent’s DVL. product is a double wall connector pipe with a reduced clearance.

7. What material is DuraBlack® made of?
DuraBlack is made from 26 gauge cold rolled steel.

8. Can I use DuraBlack® on a coal fired appliance?
Yes. DuraBlack is a Connector Pipe for wood, oil, coal, or gas fuels.

9. Can I cut DuraBlack® pipe?
People do cut the male end of stovepipe to shorten a length. Best practice however is to use our Telescopic Lengths or 2”-10” adjustable Slip Sections are available.

10. How much pipe is lost when connecting (2) pipe lengths together?
You will lose 1 1/4” per joint.

11. What is the clearance to combustibles for DuraBlack® pipe?
The clearance to combustible surfaces is 18”.

12. What is the Warranty of DuraBlack pipe?
DuraBlack has a 5-year warranty.

13. Is sealant required when connecting DuraBlack® together?
No. DuraBlack does not require sealant.

14. What holds together DuraBlack® Pipe?
Screws are required to fasten DuraBlack together.

15. Can DuraBlack® be enclosed?
No. The national code requires that stove pipe not be enclosed.

16. Can DuraBlack penetrate combustible material?
No. The National code requires stove pipe not to exit the room that it originates in.

17. What angles do the elbows come in?
90° and 45°.

18. Are DuraBlack® elbows adjustable?
Yes, DuraBlack elbows are now adjustable.

19. Why is the oval to round adapter a round piece of pipe?
To let the user customize the part to the shape needed. Contact Technical Support to assist you in choosing the correct adapter.

20. Can you attach a piece of DuraBlack® pipe below the Damper Section?
Yes, but it is recommended to be the 1st part out of stove.

21. Do I need an adapter to connect DuraBlack® to DuraVent Chimney?
Yes, a DuraBlack Slip Connector, DVL/DuraBlack Adapter, or a Snap Lock Adapter.

22. What is the DuraBlack® Slip Connector?
It is an adjustable adapter to attach DuraBlack Pipe to a DuraVent chimney, that when used with another piece of DuraBlack pipe, will create a telescoping combination.

23. How much adjustment does the DuraBlack® Slip Connector give?
The DuraBlack Slip Connector allows you 2”-10” of additional length.

24. What is the DVL®/DuraBlack® Adapter?
It is a stainless-steel adapter that can attach DuraBlack single wall stove pipe or DVL double wall stove pipe to a DuraVent chimney.

25. What is the Snap Lock Adapter used for?
It is an adapter to attach generic black pipe to a DuraVent chimney support box or wall thimble. It is used to attach any black pipe that has an inside diameter of less than the nominal size.

26. Can I decrease an 8” stove to a 6” pipe?
No. You are never allowed to decrease the stove’s flue outlet size unless specifically stated in the appliance installation instructions.

27. Can I buy the pipe straight from DuraVent?
No. We are the factory. Please contact your Regional Sales Manager to help you find a nearest Dealer in your area.

28. Is there any unpainted Stainless-Steel stove pipe?
Yes. We now sell DuraBlack SS stove pipe.

DOWNLOAD PDF

1. Is DuraConnect (flexible Gas vent segment) ICBO & BOCA approved?
Yes. DuraConnect is ICBO, BOCA, and UL approved (MH14089).

2. Is DuraConnect II a double wall flex?
DuraConnect II is a Double-Wall Type B Gas Vent flexible vent .

3. Can I use gas reliner instead of DuraConnect?
NO; reline is only listed for use inside a noncombustible masonry chimney.

4. What is the difference between gas reliner and DuraConnect?
The twist lock fitting allow connection to rigid Type B Gas Vent. DuraFlex® AL is a single wall reliner and may be cut to length.

5. Is the draft hood connector or appliance connector needed?
Yes, in most cases it is used as an appliance adapter or to connect to an actual Draft Hood on a tanked natural draft water heater.

6. Can I connect two lengths of DuraConnect?
Yes; do no let it dip or sag.

7. How do I support the system?
With the DuraConnect round support, or transition to Type B Gas Vent through ceiling and use the Type B Gas Vent Firestop Support Plate.

8. What is the clearance to combustibles?
1” clearance to combustibles.

9. What is the material used?
DuraConnect is .010” Single-ply Aluminum flex.

10. Can I connect this to an existing single wall “Wye”?
No. Only connect DuraConnect to Type B Gas Vent tees or “Wyes”.

11. Are screws required?
No screws are required.

12. Can this be installed through ceilings, walls, or chimneys?
No, it is only for use below the ceiling to the appliance.

13. What is the maximum temperature?
It is the same as Type B Gas Vent: 400 + AMB (room temperature).

14. Is it approved for use in a closet or attic?
Yes.

15. Is it okay for forced draft appliances?
No. Positive pressure, natural draft, or fan assisted only.

DOWNLOAD PDF

1. Is the insulation sleeve required?
Yes, if flex sections of DuraLiner. is used above the first flue tile you need a 1 inch clearance or insulation blanket in that upper narrow area above damper.

2. What are the outside dimensions of the pipe?
8” round is 8 5/8”, 6” is 6 5/8”, 6” oval is 4 3/4” x 7 3/4”, 8” oval is 4 3/4” x 10 3/4”.

3. How tall can I Extend-A-Cap Termination kit above masonry?
Extend-a-cap kit termination may extend from 5” to 5’ above the top of the masonry chimney. (Note: The standard termination is now obsolete).

4. Is DuraLiner® a zero clearance liner?
Yes. Double-wall DuraLiner. has a 0” clearance to combustibles inside masonry and zero clearance from
exterior of masonry to building framing.

5. Is it okay to burn coal or oil?
Yes. It is an all-fuel liner ap-proved for wood gas and coal.

6. Is the Transition Anchor Plate approved for both DuraTech® and DuraPlus® insulated chimney extension?
Yes either chimney may be used.

7. What connects the DuraLiner® to the chimney above Transition Plate?
You must use the Slip Connector Hanger assembly to join inners.

8. Is it UL 1777 tested?
Yes.

9. Can I use the insulation sleeve for other brands of pipe?
No, it is only listed for use with DuraVent®.

10. Is the 8” oval equal to the 8” round?
Yes, they are essentially the same.

11. How do I connect DuraLiner® Pipe?
Use a pop-rivet gun and the rivets provided with each length of pipe.

12. How do I install a Wall-Pass-Through?
Follow the installations instructions. For use through combustible wall.

13. Why is the oval tee single wall?
To keep width to a minimum.

14. How can I order a masonry thimble with a slip connector?
It is available in our catalog. (stock #s: 5DLR-MTSC1: 810014030, 6DLR-MTSC1: 810014031, 8DLR-MTSC1: 810014032.)

15. What type of stainless is used?
304 type stainless steel.

16. What is the clearance to combustibles?
There is no clearance to combustibles when used in masonry.

17. What is more flexible, oval or round?
Oval.

18. Can I use my own masonry termination caps?
No. You must use a DuraVent. cap for termination.

DOWNLOAD PDF

1. How much pipe will a support box hold?
The square, flat and round support boxes will hold up to 35’ of pipe. If a chimney is installed higher than 35’, an additional Wall Strap or supporting Elbow Strap must be placed every 8’.

2. How much pipe will a Tee Support hold?
The tee support bracket will hold up to 35’ of pipe. If a chimney is installed higher than 35’, an additional Wall Strap or a supporting Elbow Strap must be placed every 8’.

3. Do I have to frame around the Support Box?
Yes. All 4 sides need to be framed. See installation instructions for dimensions.

4. Can I extend the height of a DuraPlus® Support Box?
Yes. DuraVent® offers various support box heights to fit most every installation. Should one wish to extend a support box beyond these dimensions, DuraVent® offers a “Close Clearance Shield”. Always follow the appropriate installation instruction for full details.

5. When do I have to use an Attic Insulation Shield?
The attic insulation shield is required at the point where the chimney pipe passes through an attic space. An attic shield is not required if an enclosure surrounds pipe from the floor of the attic to the underside of sloped roofline.

6. Do I need to use a wall thimble when going through a concrete wall?
Yes, DuraPlus® requires a wall thimble whenever passing through a wall.

7. What is the longest piece of pipe that I can use through a wall thimble?
The maximum length of pipe recommended for a through the wall installation is 2’.

8. What size hole is needed in the wall for a wall thimble?
A 14 1/2″ diameter hole on the inside and outside walls.

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

10. How many elbow straps do I need for an offset?
If the total length of chimney sections between the 2 elbows is greater than 3’, install a second elbow strap around the center of the chimney section.

11. Can I add more than one elbow together to make an angle greater than 30°?
No. However, you can use the sheet metal screws if desired, making sure you don’t penetrate the inner liner.

12. How many offsets can I have in DuraPlus® pipe?
DuraPlus can have 2 offsets and a total of 4 elbows.

13. Can I offset directly on top of a support box?
No. You must use a piece of pipe to raise the start of the elbows above the support box. At that point, you can then start your offset.

14. What is the maximum offset?
Consult the Offset Chart for maximums usually two 2’ lengths of pipe between the elbows.

15. What adapter should I use to connect to a Zero Clearance fireplace?
A DuraPlus Base Plate Adapter should be used off the top of a metal Zero/clearance Fireplace.

16. Can I use DuraPlus® with DuraLiner®?
Yes. The use of DuraPlus at the Transition Anchor Plate is acceptable.

17. Is a DuraVent® manufactured cap mandatory?
Yes. In order to have an approved UL listed system, you must use a DuraVent cap.

18. When do I use ventilated flashing?
Always. This is required per our UL listing. All flashing now has ventilation.

19. Can I paint the galvanized outer pipe?
Yes. Before you paint, wash the outer pipe with a vinegar and water solution. Use a high temperature paint.

20. What is the outside diameter?
For 6”-8” diameter (ID) DuraPlus Chimney, add 4” to the ID.

21. Are DuraPlus®, DuraTech®, & DuraChimney® II interchangeable?
No. DuraPlus is rated at 2100Æ (HT) and should not be mixed with other chimneys.

22. Can I buy the chimney pipe from DuraVent®?
No. DuraVent products are sold through Distribution. On the DuraVent website you can use the Dealer Locator that will assist you in finding the nearest dealer in your area or an approved online seller.

23. What is the stainless and black rings that came in my DuraPlus Chimney Kit?
These are the new Chimney to Stovepipe Adapters to all connector pipe to lock to the chimney. SS is for DVL® and the Snap Lock is for DuraBlack® or competitor’s stove pipe.

24. How do I get the termination cap off?
Unscrew the 4 screws around the lower base of cap, the lift the lid with legs attached. Now you have access to the inner diameter to clean.

25. What type of chimney brush should I use to clean the chimney?
We recommend a flexible plastic or “poly” brush be used to clean your system annually or as required.

26. How often should I clean my system?
The warranty requires annual cleaning or inspection. It is recommended that you brush your system once for every cord of burn.

DOWNLOAD PDF

1. Is a Stove Top Adapter required?
No; the adapter is not always required. If the inner liner of your pipe can fit inside of the collar on you stove the Adapter is not needed. Stoves with an outlet even slightly under 6” will need it.

2. What is the clearance to combustibles?
6” horizontal clearance to walls and an upper 8” clearance to ceiling or mantels.

3. Is it 2100° rated pipe?
Yes. Approved for use as a Class A connector 1000 F degrees.

4. Is it HUD approved for use in mobile homes?
Yes DVL® meets this standard for use in mobile homes where single wall is not permitted.

5. How can I reduce my clearance from 6”?
You can’t; it would be up to your local building authority.

6. Can I paint it?
Yes. The DuraVent Engineering Dept. recommends Stove Bright Touch Up Paint, or any Hi-Temp stove paint.

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

8. Why does my new DVL® stovepipe smell?
Our high temp paint is heat cured during the first few burns on a new system. see the Instruction Manual stating to open windows and provide ventilation until stovepipe is heat cured.

DOWNLOAD PDF

1. What is the minimum clearance to combustibles?
1” clearance to combustibles. Older systems had a 3” labeled clearance but have been re-tested.

2. Do I need sealant or tape on connections?
500RTV silicone sealant is required on inner liner overlap connects and on connection of pipe adapter to the appliance. If using PVP (PelletVent Pro), use of sealant is not required.

3. What is the minimum termination height above the roof?
1’ minimum of pipe is required above the high side of the opening cut in roof.

4. Why is the Stove Adapter loose at the collar of the stove?
All stoves vary and so does the fit of adapter. Connection is always sealed and screwed.

5. What flashing do I use for roof pitches over 7/12?
Use the gas vent flashing for a steep roof (order #s: 3GVFSR, 4GVFSR) for steep pitch up to 12/12.

6. What flashing do I use for a tile roof?
DSA Roof Flashing (Stock #s: 3PVP-F6DS, 3PVP-F12DS, 4PVP-F6DS, 4PVP-F12DS).

7. Why don’t I have tee supports?
DuraVent® wall straps are approved to support the tee.

8. How close to the wall can I terminate?
6” minimum distance from the wall to pipe, then add horizontal Termination cap.

9. Can I seal the pipe where it passes through the thimble?
Yes. Use a 500° RTV Silicone Sealant.

10. Do PelletVent® Elbows and Tees have a 360 swivel?
There is no swivel on tees or elbows, but you may not fully tighten for better alignment.

11. Are the 45° and 90° elbows adjustable?
No. The elbows are factory sealed at 45° or 90° to prevent leakage under pressure.

12. What do I use to install through cathedral ceilings?
Use a cathedral ceiling support box.

13. How do I extend the wall thimble?
Use similar material to extend the sleeves. Must maintain a 1” overlap.

14. Why is the 2’ 10’ Termination rule not followed?
PelletVent® terminates 1’ above the roof because the fan gets the exhaust airborne.

15. Can I use B vent instead?
No. Use PelletVent® only. It has a stainless inner required for wood pellet burning.

16. Is there a high wind PelletVent® cap?
No. Use the vertical cap termination.

DOWNLOAD PDF

1. What is the minimum clearance to combustibles?
1” clearance to combustibles.

2. Is the PelletVent Pro® approved as a Category III UL1738 for use on horizontally terminating Unit Heaters and Radiant Tube Heaters?
Yes, PelletVent Pro is gasketed with laser welded super-ferritic stainless steel inners and approved sidewall Termination Caps.

3. What is the minimum termination height above the roof?
1’ minimum of pipe is required above the high side of the roof.

4. Why is there so much slope at the collar of the stove?
The problem is with the stove manufacturer, not the vent.

5. What flashing do I use for roof pitches over 7/12?
Use the gas vent flashing for a steep roof (order #s: 3GVFSR, 4GVFSR)

6. What flashing do I use for a tile roof?
DSA Roof Flashing (Stock #s: 3PVP-F6DS, 3PVP-F12DS, 4PVP-F6DS, 4PVP-F12DS)

7. Why don’t I have tee supports?
DuraVent® wall straps are approved to support the tee.

8. How close to the wall can I terminate?
6” minimum distance from the wall to pipe.

9. Can I seal the pipe where it passes through the thimble?
Yes. Use a 500° RTV Silicone Sealant.

10. Which side of the thimble goes on the interior wall?
The black side goes on the interior wall.

11. Are the 45° and 90° elbows adjustable?
No. The elbows are factory sealed to prevent leaking under pressure.

12. What do I use to install through cathedral ceilings?
Use a cathedral ceiling support box.

13. How do I extend the wall thimble?
Use similar material to extend the sleeves. Must maintain a 1” overlap.

14. Why is the 2’ 10 rule for Chimneys not followed?
PelletVent Pro® terminates 1’ above the high side of opening in roof because the fan gets the exhaust airborne.

15. Can I use B vent instead?
No. Use PelletVent® Pro only it has the required SS inners to burn wood pellets.

16. Is there a high wind PelletVent Pro® cap?
No. Use the vertical cap termination.

17. Do I need sealant or tape on connections?
Sealant is required with old-style PVL. If using PVP (PelletVent Pro) with silicone O-rings, the use of sealant is not required.