DuraVent CVS Concentric Venting System – Wall Thimble

$123.33

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SKU: 35CVS-WT Categories: , Brand:

DuraVent CVS Wall Thimble: a framed wall passage for gas appliance venting

The DuraVent CVS Wall Thimble is a framed sleeve that carries a gas appliance’s vent through an outside wall. It fits between standard wall studs and gives the pipe a finished opening on each side. This thimble is for gas appliances only, and the appliance maker must approve CVS for that model. CVS is DuraVent’s concentric vent: the exhaust runs up a 3 inch inner pipe while combustion air comes in through the 5 inch outer pipe around it.

The space needed around the pipe depends on the appliance. CVS used as a double wall gas vent inside an enclosure is listed for zero clearance to wood framing. Pellet venting needs 1 inch from anything that can burn. For direct vent gas stoves and fireplaces, the appliance maker sets that gap. Leave any required gap empty, not filled with insulation. The outside gas vent cap must sit at least 12 inches above the ground, deck, or porch and above expected snow. The appliance maker may require more space. Need the sleeve with an insulation ring? See the DuraVent CVS Wall Thimble with Reduced Air Infiltration. The DuraVent CVS Wall Thimble ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Details

SKU: 35CVS-WT

Applications

Concentric Venting System (CVS) (direct vent or two-pipe system) for use with condensing 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 500°F). For use with Stoves and inserts of Type L gas, pellet, oil, corn and biofuel (Rated to a continuous use flue temperature up to 570°F). CVS can be used on a wide range of appliances, including: gas boilers, warm air furnaces, water heaters, unit heaters, tankless water heaters, pellet stoves, direct vent gas or propane stoves, heaters, and fireplaces.

Materials and Construction

Unitized concentric construction. Inner: Laser-welded UL approved 444 super-ferritic stainless steel .012″ Outer: Laser-welded, paintable, zincalume .018″ Silicone O-ring seals on inner liner and outer wall. Precision twist-lock connection on outer wall.

Clearances

CVS is listed to 0” clearance as a double-wall vent system for Category II, III, and IV appliances, for flue temperature of up to 400°F for horizontal enclosures, and up to 480°F for vertical enclosures. CVS must maintain 1” clearance to combustibles when used with pellet fuel. When CVS is used as a concentric/direct vent system on gas, the clearance to combustibles is specified by the appliance manufacturer.

Diameters

3″ inner and 5″ outer.

Listings

CVS vent pipe is listed to UL 1738 (MH25700) as a double-wall vent system for Category II, III and IV appliances. It is pressure rated to 10 WC for the inner pipe. This product is also intended to be used as a direct vent system for Listed to UL 1738 (DGSH.MH25700) and ULC S636 (DGSH7.MH25700). Pressure rated to 10” W.C. Listed to UL 641 (DFTX.MH8381), ULC S609 (DFTX7.MH8381), and ULC/ORD 441 (DFVAC.MH21150). Listed in combination with gas appliances, has been tested and listed as a decorative gas appliance system or as a direct vent heater system. Check with your appliance manufacturer for approval.

Instructions

Typical Installation

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

DuraTech Canada installation_1

Product Resources

Catalogs

Bulletins

Sales Sheets

Educational Papers

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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