02E
DURAVENT
DIRECT VENT PIPE
New York Distributors Hearth & Home
WHAT IS DIRECT VENT?
A system designed and built to exhaust gas burning appliances listed as Direct Vent decorative gas appliances. The venting is part of a sealed and balanced system with an air intake and exhaust designed into the venting.This type of venting system is a component of the appliance manufactures listed system.
PRODUCT LINES
CVS® - Provides Ortal Branded Fireplace Systems and as a Direct Vent for Pellet Stoves.
​
DirectVent® Pro - Unitized, co-axial venting system for direct vent gas or propane stoves, heaters and fireplaces.
CVS®
SUMMARY
An economical venting solution for condensing and noncondensing appliances, the Concentric Venting System (CVS) features a UL1738 approved super-ferritic stainless steel inner wall.
The proprietary twist-lock connection eliminates use of clamps or mechanical fasteners and saves installation time. Only one penetration is needed through the roof or the wall for both exhaust and combustion air. Multiple pipe lengths and telescoping pipe extensions eliminate field cutting of pipe.
CVS is the only concentric vent system to incorporate o-rings on the inner wall and outer casing to prevent exhaust or combustion air leakage.
Custom adapters are available to transition from co-linear to coaxial venting systems. The built-in condensate management system prevents standing condensation. The Concentric Venting System is a fully sealed, gas tight system to deliver superior performance with the heating unit.
Applications
CVS®
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
CVS®
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®
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
CVS®
3" inner and 5" outer.
Listings
CVS®
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.
TYPICAL INSTALLATION
Advantages of Concentric:
A concentric (or direct-vent, or two-pipe) system maintains indoor air quality by reducing drafts with one penetration, and allows for better humidity level control inside a dwelling. Concentric venting brings to the heating appliance outdoor air as combustion air through an air-tight, sealed system that is safe.
DIRECT VENT® PRO
SUMMARY
Stunning design and Engineered Excellence® utilizing state-of-the art manufacturing. DirectVent Pro features tight inner connections for superb performance, with no gaskets or sealants required (unless specified by the appliance manufacturer). All black pipe lengths, pipe extensions, and elbows feature laser-welded outer wall seams for a sleek finish. Low-profile locks and no hems or beads allow for a beautiful product that looks elegant in any interior.
Engineered Excellence® with innovation and style...DirectVent Pro. DuraVent's direct vent is specified exclusively by nearly every major stove and fireplace manufacturer in the U.S. and Canada, with the largest choice of termination caps for direct vent available.
Applications
DirectVent®
PRO
DirectVent Pro is a unitized, coaxial (concentric) venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces.
Materials and Construction
DirectVent®
PRO
.020" aluminum inner wall. .018" galvanized steel outer wall. Painted outer walls made of laserwelded .018" galvalume steel. Caps also available in stainless steel and copper. Outer pipe brings combustion air to the appliance. Inner pipe exhausts flue gases to the outside. Gaskets or sealants not required (unless specified by the appliance manufacturer).
Clearances
DirectVent®
PRO
Specified by the appliance manufacturer.
Diameters
DirectVent®
PRO
4" x 6 5/8" and 5" x 8".
Listings
DirectVent®
PRO
DirectVent Pro, in combination with the gas appliance, has been tested and listed as a decorative gas appliance system or as a direct vent heater system by a major testing agency, such as UL, CSA, Warnock Hersey, or OMNI. Check with your appliance manufacturer for approval.
TYPICAL INSTALLATION
Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation.
Installation Key
​
1. Vertical Termination Cap
2. Storm Collar
3. Flashing
4. Cathedral Ceiling Support Box
5. Pipe
6. 45° Elbow
7. Class A Chimney Conversion Kit
8. 4" Flex
9. 90° Elbow
10. Horizontal Termination Cap
11. Snorkel Termination Cap
12. Colinear Kit
13. 3" Flex
14. Co-Axial to Co-Linear Connector
15. Masonry Chimney Conversion Kit
16. Elbow Strap
PLANNING YOUR INSTALLATION
DESIGN RECOMMENDATIONS
1. For vertical gas stove installations, measure the height from the stove outlet to the ceiling to determine the length of black pipe required. Select a ceiling support/wall thimble cover or a cathedral ceiling support box.
​
2. To determine the length of galvanized pipe required, measure the ceiling thickness and the vertical rise in an attic or second story. Firestops are required at each floor level beyond the first floor ceiling support/wall thimble cover or cathedral ceiling support box. If an offset is required to avoid obstructions, use a pair of 45° elbows. For proper support, use elbow straps with offsets. Use wall straps for long vertical runs. Attic Insulation Shield is required in attic.
​
3. Measure the roof pitch. Select the proper flashing and storm collar. Determine the minimum height above the roof.
​
4. For horizontal installations, check the appliance manufacturer’s instructions for minimum rise and maximum horizontal run. A snorkel termination may be used if height restrictions prevent adequate rise above the appliance. Select the appropriate Horizontal Termination Cap (see appliance manufacturer installation instructions). To protect vinyl siding, select vinyl siding standoff. Check appliance manufacturer’s instructions for wall thimble and firestop requirements.
The following design recommendations are general guideline to assist in the design and selection of venting components for your installation. Always follow DuraVent Installation instructions enclosed with the cap or support box before installing your chimney system. Installation instructions can be viewed online at www.duravent.com, under Catalogs and Instructions. Important: Check the manufacturer's rating plate and instruction manual to confirm that the DuraVent direct vent system is approved for use on the brand name appliance you have selected.
​
1. The inner and outer pipe diameters should match the outlet size of the appliance.
​
2. 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.
​
3. Be fire safe! Maintain at least 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.