DuraVent FasNSeal – Severe Weather Wall-Mount Insulated Kit

$906.86

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DuraVent FasNSeal Severe Weather Wall Mount Insulated Kit: a wall vent kit for very wet, cold weather

The DuraVent FasNSeal Severe Weather Wall Mount Insulated Kit is a through wall vent kit for wall hung boilers and tankless water heaters. It helps keep the appliance from freezing while letting exhaust flow out. Inside are an insulated wall thimble, the sleeve through the wall, with a tee shaped outlet, an adjustable 90 degree elbow, and a universal appliance adapter with a condensate drain and back draft preventer. The latter blocks backward airflow. This 4 inch kit fits most appliances with a 4 inch exhaust. 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.

The outlet must be at least 12 inches above ground and the snow line, or higher if the appliance maker requires it. For deep snow, DuraVent suggests an additional outdoor 90 degree elbow and vent length to raise the outlet. In cold climates, drains must stay indoors. Need a kit for milder weather? See the DuraVent FasNSeal Standard Wall Mount Insulated Kit for ordinary weather. The DuraVent FasNSeal Severe Weather Wall Mount Insulated Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Details

SKU: FSSWWMKI04

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 makes this the Severe Weather wall-mount kit?

Its parts are chosen for extreme wet and cold: an insulated Wall Thimble with a Termination Tee, an adjustable 90-degree elbow and a Universal Appliance Adapter with a built-in condensate drain and a back-draft preventer. Together they keep the exhaust unobstructed and prevent the appliance freezing up. It is a 4-inch kit for wall-mounted boilers and tankless water heaters.

How is it different from the standard wall-mount kit?

The standard kit ends in a wall termination and a plain appliance adapter. This one terminates in a tee, adds the condensate drain at the adapter so freezing condensate cannot collect, and adds a back-draft preventer. DuraVent also suggests adding a 90-degree elbow and a vent length outside the house to lift the termination above high snow lines.

Which appliances can it vent?

Most 4-inch exhaust natural gas or propane appliances in Categories II, III and IV rated to 480 F and 15 inches water column, such as condensing boilers and tankless heaters, provided their manual lists a special gas vent like FasNSeal. The appliance manual also sets the maximum vent length and the termination distances from windows, doors and grade.

How do I connect and slope it?

Joints push together, turn until half the bead is covered, and the built-in locking band is tightened snug plus a quarter turn over the gasket; no sealant or screws. Pitch the horizontal run at least 1/4 inch per foot back toward the appliance, route the drain tubing with a trap loop and dispose of the acidic condensate per local code.

What clearance does the vent need through the wall?

The insulated thimble carries the pipe through the wall; elsewhere the clearance follows the FasNSeal manual’s Table 2 for the appliance’s rated temperature, for example 4 inches around an unenclosed horizontal run and 1 inch on a vertical run at a 300 F rating for single-wall 4-inch vent. Vent lengths and elbows for the outside rise 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.

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