DuraVent PelletVent Pro – Pellet Vent Factory-Built Reline Kit

$1,184.46

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DuraVent PelletVent Pro Factory Built Reline Kit: reuse an existing metal chimney for your pellet stove

The DuraVent PelletVent Pro Factory Built Reline Kit is a flexible stainless steel liner kit for an existing metal chimney or B vent, a gas vent. It carries exhaust inside the old vent rather than requiring a new pipe route. A pellet stove cannot exhaust directly through unlined B vent. DuraVent lists the kit for wood, pellet, and biofuel appliances. Choose a 3 inch kit with 20 feet of liner or a 4 inch kit with 35 feet, then select 304 or 316 stainless steel. DuraVent calls for an experienced professional to install it after the chimney is inspected and cleaned.

The liner joins PelletVent Pro pipe and a stove adapter below. PelletVent Pro is DuraVent’s double wall pellet stove vent: a corrosion resistant stainless steel inner pipe inside a galvalume outer pipe, sold in 3 and 4 inch sizes. Routing limits depend on the stove. DuraVent advises keeping runs short and bends few to reduce moisture buildup. A tee behind the stove with a removable cleanout cap gives a brush access for cleaning. Relining masonry instead? See the DuraVent PelletVent Pro BioFlex Pipe masonry chimney liner. The DuraVent PelletVent Pro Factory Built Reline Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Details

SKU: 3PVP304-20KFB | 3PVP316-20KFB

SKU : 4PVP304-35KFB | 4PVP316-35KFB

Applications

PelletVent Pro® is a venting system designed for stoves and inserts that use wood pellets and oil fuel. It is also built to vent biofuel products such as corn, switch grass, cherry pits, soybeans, coffee husks, sunflower hulls, walnut shells and wheat, to name a few. (Rated for continuous use flue temperaftures up to 570°F.)

Materials and Construction

Laser-welded, double-wall pipe with a .012″ inner wall of 444 stainless steel and a .018″ laser-welded galvalume outer wall. Painted black exterior available. Primary metal-to-metal connection seals joint. Encapsulated o-ring provides a secondary seal.

Clearances

1″ clearance to combustibles in the USA and Canada for appliances using corn and other biofuels, wood pellets or oil.

Shrouds

UL Listed with Duravent shroud specifications.

Diameters

3” and 4”

Listings

c-UL-us Listed to UL 641 (MH8381 and MH14420).

ULC Listed to ULC S609, ULC/ORD C441 (CMH1439 and CMH1440).

Instructions

Typical Installation

Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation.

  • The inner pipe diameter should match the outlet size of the appliance. For installations that require 4″ vent and the appliance has a 3″ outlet, use an Increaser Adapter 3″-4″.
  • Check the appliance manufacturer’s installation instructions to confirm which types of vent configurations are permitted (i.e. horizontal, vertical, chimney reline, etc.). Also, check for any venting restrictions such as maximum horizontal run, minimum and maximum vertical rise, maximum offset, etc.
  • Be fire safe! Maintain the minimum clearances (air-space) between the vent pipe and nearby combustibles, as specified in the appliance manufacturer’s installation instructions. Use proper support and bracing. Follow local building codes and have your venting system inspected.
Installation Key
1 Vertical Cap
2 Storm Collar
3 Flashing
4 Cathedral Ceiling Support Box
5 Straight Length Pipe
6 45° Elbow
7 Appliance Adapter
8 Flex Length
9 90° Elbow
10 Horizontal Cap
11 Wall Thimble
12 Celling Support Firestop Spacer
13 Tee w/Clean-Out Tee Cap
14 Wall Strap
15 Attic Insulation Shield
16 Prairie Termination Cap

Planning Your Installation:

1 Refer to the Typical PelletVent Pro Installations diagram, on the opposite page, to be familiar with some of the standard PelletVent Pro installations and the required component parts.
2 For a horizontal termination, you will need a Wall Thimble and a Horizontal Cap. The cap must be installed with a 6″ clearance to the outside wall (refer to appliance manufacturer’s installation instructions for other clearances).
3 For a vertical termination, you will need a Cathedral Ceiling Support Box or Flat Ceiling Support, Attic Insulation Shield (if passing through an attic), Flashing, Storm Collar, and Vertical Cap.
4 Determine the length of PelletVent Pro pipe required. For a vertical termination, measure the pitch of the roof and select the proper flashing. The required minimum height above the roof is 12″.
5 Pellet stove inserts in masonry fireplaces will require a flex pipe to snake the vent past the smoke shelf. For transition from PelletVent Pro to an existing DuraPlus, DuraPlus HTC, or DuraTech Chimney, a Chimney Adapter is available.
6 For vertical rise of PelletVent Pro on the outside of the house, Wall Straps should be used at 4′ intervals to provide proper support.
7 Important! Check to be sure that the appliance and the venting system are in compliance with all minimum clearance to combustible requirements.

The following design recommendations are a general guideline to assist in the design and selection of venting components for your installation. Always follow Duravent Installation instructions before installing your chimney system (found with the cap or support box).

  • Size the vent to meet the appliance manufacturer’s specifications.
  • Avoid long runs and excessive use of elbows. Refer to the appliance manufacturer for minimum rise and maximum run configurations for the venting system.
  • Use an Appliance Adapter to ensure a proper connection to appliance. Seal adapter to appliance with high temperature sealant.
  • Use a Single Tee with Clean-Out Tee Cap to facilitate easy cleaning. It is recommended to use a tee off the back of an appliance.
  • In the United States and Canada, maintain the minimum 1″ clearance (air space) from vent pipe to combustibles. Use proper support and bracing. Follow local building codes and have your venting system inspected. Be fire safe!

Product Resources

Catalogs

Bulletins

Brochures

Sales Sheets

Educational Papers

Videos

PelletVent Pro® Tee: New Double Spring Button Design Video

PelletVent® Horizontal Installation Video

PelletVent® Installation Guide Video

304 vs 316 Stainless Steel

304 vs. 316 Stainless Steel — What’s the Difference?

Both 304 and 316 are high-quality stainless steels known for durability, corrosion resistance, and strength. The main difference comes down to one added element:

 

 

316 Stainless Steel

316 has 2–3% molybdenum, which dramatically boosts corrosion resistance — especially against:

  • Saltwater
  • Chlorides
  • Harsh outdoor environments
  • Chemicals
  • 316 is more expensive (usually 15–30% more) because of its enhanced composition
316 Stainless Steel
304 Stainless Steel

304 Stainless Steel

304 Stainless Steel does not contain molybdenum
 
  • Great for indoor and general outdoor use
  • Can show pitting or corrosion over time near the ocean or when exposed to salts/chlorine
  • 304 is more budget-friendly while still offering excellent durability

 

Common Uses

316 Stainless Steel

  • Marine equipment

  • Cold plunge tubs exposed to chlorine or salt

  • Coastal installations

  • Medical and surgical equipment

  • Chemical environments

304 Stainless Steel

  • Appliances

  • Indoor tubs and tanks

  • Furniture

  • Mild outdoor environments

  • Food-grade equipment

Molybdenum

 

FAQ about Molybdenum

 

  • Molybdenum is a naturally occurring trace mineral found in soil, plants, and even the human body.
  • It’s essential for human health in small amounts because it helps enzymes function properly.
  • In stainless steel, the molybdenum is tightly bound within the metal alloy and does not leach out in any meaningful way.

So when used in 316 stainless steel, molybdenum is:

  • Not toxic

  • Not harmful to humans

  • Not a health concern, even with daily contact (e.g., water bottles, cookware, cold plunge tubs, medical tools)

FAQ

What is the Pellet Vent Factory-Built Reline Kit for?

It relines an existing factory-built chimney or Type B gas vent so a pellet or biofuel stove can vent through it instead of running new pipe. A flexible stainless liner runs inside the old chimney and connects to PelletVent Pro at the appliance, following DuraVent’s Factory-Built Chimney Relining supplement linked in the Instructions tab.

Which size and material should I select?

Pick the diameter first: 3-inch kits come with a 20-foot liner, 4-inch kits with a 35-foot liner. Then choose the liner alloy, 304 or 316 stainless; 316 gives more corrosion resistance for the acidic flue gases some biofuels produce, at the price shown on the selector. Match the diameter to the stove outlet and the stove manual’s venting rules.

Can I reline a B vent for a pellet stove?

Yes, that is one of the two uses DuraVent lists for this kit, along with factory-built chimneys. The pellet stove must never vent through the bare B vent, which is aluminum-lined and not approved for pellets; the liner carries the exhaust and the old vent becomes the chase. Have the existing chimney inspected and cleaned before relining.

What clearance applies to a relined chimney?

The PelletVent Pro system keeps its 1-inch clearance to combustibles where it runs exposed, and inside the existing chimney the reline supplement governs. Follow the stove manual for maximum vent length and rise; many manufacturers limit the number of elbows and total run for a pellet stove.

What else do I need to finish the reline?

The PelletVent Pro pipe, appliance adapter and any tee between the stove and the chimney, plus the termination at the top as the supplement describes. Seal the appliance connection with 500 F RTV silicone. The connecting parts are in the PelletVent Pro category; this kit supplies the liner itself.

Shipping / Freight / Return Info

Same-Day / 24 hour shipping

Same-Day/24 hour shipping - If we have the product in stock, we can ship same day if ordered before 12pm Monday - Friday (CST).

Freight Claims Policy

Please follow these very important steps when it comes to Freight Items that are damaged or missing
  • Open and inspect the order while the delivery driver is present. If delivery driver does not provide sufficient time to do so, please notate the delivery receipt.
  • By signing the delivery receipt without noting any damage or missing items, you confirm that your order arrived complete and in excellent condition.
  • Record any damage or missing pieces directly on the delivery receipt.
  • Do not discard damaged item(s) or any original packaging. For severe damage, write “Refused due to damage” on the delivery receipt and contact us immediately.
  • Report any damage within two business days, including delivery details and photos showing the issue
  • Damaged item(s) must be returned within 30 days. Failure to return them will result in a charge to the original payment method.

Return Merchandise Authorization Policy

Please follow these very important steps when Returning Items. Contact our team.
  • Submit your return request within 30 days of delivery.
  • You will receive an email within 1-2 business days confirming whether your return request has been approved or denied.
  • Please also note that a 20% restocking fee may apply to approved returns
  • If approved, you will receive an itemized Return Authorization, return shipping labels (if requested), and detailed instructions within 1–2 business days
  • From the date this email is received, you will have 14 days to return the product.
  • Once our distributor receives and inspects the returned item(s), your refund will be issued within 1–2 weeks
  • Items returned outside of this process or time frame are not eligible for a refund.

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