DuraVent FasNSeal – Standard Wall Mount Insulated Kit

$560.51

✓ Free Shipping
✓ No Sales Tax (except WY)
✓ 100% Price Match Guarantee

DuraVent Logo

DuraVent Logo    Authorized Dealer – Full Warranty Included

Choose Size *

3" – FSWMKI03 – (+$0)
4" – FSWMKI04 – (+$59.83)
Product price: $560.51
Total options:
Order total:
SKU: FSWMKI03 Categories: , , Brand:

DuraVent FasNSeal Standard Wall Mount Insulated Kit: three parts for venting through the wall behind your appliance

The DuraVent FasNSeal Standard Wall Mount Insulated Kit is a three part vent kit for one wall hung boiler or tankless water heater. It carries exhaust through the wall behind the appliance, not through the roof. The insulated wall thimble is a sleeve that passes through the wall and includes the outside vent ending. An adjustable 90 degree elbow turns the vent, while a universal appliance adapter connects it to the appliance. FasNSeal is DuraVent’s stainless steel vent for high efficiency gas boilers, furnaces, and water heaters, built to carry pressurized exhaust and its acidic condensate outside.

Choose a 3 or 4 inch size on this page. The kit adjusts from 16 1/2 to 21 inches vertically and 8 to 12 1/2 inches out from the wall. It serves natural gas or propane appliances that call for a special gas vent. The appliance maker sets the allowed vent length and whether wall venting is permitted. Live somewhere very wet and cold? See the DuraVent FasNSeal Severe Weather Wall Mount Insulated Kit. The DuraVent FasNSeal Standard Wall Mount Insulated Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Details

SKU: FSWMKI03 | FSWMKI04 | FSWMKI05

Applications

FasNSeal is for use with natural gas or propane Categories II, III and IV appliances or Canada’s Type BH Gas Vent Systems, having a maximum rated operating temperature of 480°F and a maximum positive pressure of 15″ (FasNSeal Flex 6″) water column. FasNSeal can be used on a wide range of applications, including: high efficiency gas boilers, furnaces, booster heaters, pool heaters, water heaters, unit heaters, or tankless water heaters.

Materials and Construction

3″–7″: 29-4C or 316L stainless steel .016″

8″–12″: 29-4C or 316L stainless steel .019″

14″–16″: 29-4C or 316L stainless steel .024″

Diameters

3″ – 16″

Listings

UL Listed to UL 1738 and ULC S636.

Instructions

Typical Installation

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

FasNSeal

More Typical Installations

FasNSeal installation

Installation Key

1 Rain Cap
2 Storm Collar
3 Variable Pitch Roof Flashing
4 Vent Length
5 Adjustable Vent Length
6 Firestop/Flat Flashing
7 Horizontal Drip Tee
8 Elbow
9 Universal Condensate Drain
10 Appliance Adapter
11 Top Plate*
12 Male Flex Adaptere
13 FasNSeal Flex
14 Female Flex Adapter
15 Standard Tee

Commercial Applications

Commercial projects may require custom parts and unique system designs. Duravent offers complete project assistance:Commercial projects may require custom parts and unique system designs. Duravent offers complete project assistance:

  • Engineering Services: Personalized system design services offer comprehensive CAD submittal drawing and complete bills of materials.
  • Custom Parts: If your project requires innovative solutions, contact Duravent for custom parts that meet your specific project needs.
  • FasNSeal W2: FasNSeal W2 is the ideal choice for commercial applications where there is a need for low clearances to combustibles.
  • Up to 16” Vent Diameters: Many commercial applications require large diameter systems due to the units size and output. Large diameters are available in single and double wall, featuring FasNSeal’s triple lipped directional gaskets and built-in locking band which provides a safe and convenient installation.

Product Resources

Catalogs

Submittals

Bulletins

Brochures

Spec Sheets

Educational Papers

FAQ

What is in the FasNSeal Standard Wall Mount Insulated Kit?

An insulated Wall Thimble with termination, an adjustable 90-degree elbow and a Universal Appliance Adapter, the parts to vent a wall-mounted condensing boiler or tankless water heater straight out through the wall behind it. It adjusts vertically from 16-1/2 to 21 inches and horizontally from 8 to 12-1/2 inches; choose 3 or 4 inch on the selector (a 5-inch tankless version also exists).

Which appliances can use FasNSeal?

Natural gas or propane Category II, III and IV appliances, or Type BH vents in Canada, with a maximum rated operating temperature of 480 F and up to 15 inches water column positive pressure: high-efficiency boilers, furnaces, booster and pool heaters, water heaters, unit heaters and tankless heaters. The appliance must be listed for a special gas vent, and its manual sets the maximum vent length.

How do the joints seal?

Each female end has a triple-lipped directional gasket and a built-in mechanical locking band. Push the male end in and turn until half the bead is covered by the flared female end, then tighten the band with a nut driver until snug plus a quarter turn. No sealant or screws are used, and the components that touch exhaust are silicone-free 29-4C or 316L stainless.

Does the horizontal run need a slope or a drain?

Yes. FasNSeal horizontal runs must pitch at least 1/4 inch per foot back toward the appliance so condensate drains, which the thimble’s built-in adjustable length makes easy. If the appliance has no internal drain, DuraVent strongly recommends a Universal Condensate Drain or drain tee close to the flue collar, with a trapped loop in the tubing and disposal per local code.

What clearance to combustibles does the thimble kit need?

It depends on the appliance’s rated flue temperature; the FasNSeal manual’s Table 2 gives the figures. For a 3 or 4 inch single-wall vent at a 300 F rating, unenclosed, that is 4 inches around a horizontal run and 1 inch on a vertical run, more inside an enclosure. The insulated thimble handles the wall pass-through; never fill the clearance space with insulation.

Where can the termination sit on the wall?

Follow the appliance manual and NFPA 54 for distances from windows, doors, air inlets, grade and the gas regulator; DuraVent’s instructions require an obstruction-free exhaust. For very wet, cold sites DuraVent’s Severe Weather kit adds a drain and back-draft preventer. Vent lengths and drains are in the FasNSeal category.

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.

Customer Reviews

Be the first to review this product

What Our Customers Say

Shop by Best Sellers

Fireplace

Get In Touch

Call or Text us for our Best Price

It's important to us to go above and beyond for our clients and make sure you make the right decision for your home.