DuraVent DirectVent Pro Masonry Chimney Conversion Kit: use an existing masonry chimney for a gas stove
The DuraVent DirectVent Pro Masonry Chimney Conversion Kit is a connection kit for a gas stove and an existing masonry chimney. It serves stoves with 4 by 6 5/8 inch venting. Exhaust travels up a 4 inch aluminum flexible liner to an adapter at the chimney top. Incoming air travels down around the liner, then through the chimney side to the lower connector where the stove pipe attaches. Have a chimney sweep inspect the chimney first to check that it is sound. DirectVent Pro is DuraVent’s pipe inside a pipe vent for direct vent gas fireplaces and stoves: exhaust goes out through the inner pipe and outside air comes in through the outer pipe.
Choose the full kit or just the cap adapter and flashing, the metal cover for the chimney top. The full kit also includes the lower connector and round black wall cover. Buy the vent cap and flexible liner separately. For wood framed walls, the stove maker may call for an extra protective sleeve or firestop. Converting a metal chimney? See the DuraVent DirectVent Pro Chimney Conversion Kit. The DuraVent DirectVent Pro Masonry Chimney Conversion Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 46DVA-KMC | 46DVA-KCT
Applications
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
.020″ aluminum inner wall.
.018″ galvanized steel outer wall.
Painted outer walls made of laser-welded .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
Specified by the appliance manufacturer.
Diameters
4″ x 6 5/8″ and 5″ x 8″.
Listings
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.
FAQ
What does the Masonry Chimney Conversion Kit do?
It lets a 4 x 6-5/8 inch direct vent gas stove use an existing masonry chimney: the exhaust and combustion air are routed out through the side of the chimney and up a 4-inch flex liner to a cap adapter on top. The 46DVA-KMC kit has the Cap Adapter, an 18 by 18 inch flashing, a Round Ceiling Support/Wall Thimble Cover and the Retro Connector.
What is the difference between the two kit options on the page?
The full kit (46DVA-KMC) includes the Cap Adapter, flashing, Round Ceiling Support/Wall Thimble Cover and Retro Connector. The second option (46DVA-KCT) is the Cap Adapter and flashing only, for installers who already have the wall-side parts. Both leave out the DirectVent Pro termination cap and the 4-inch flex, which are sold separately.
How is the conversion installed?
Per DuraVent’s L904 instructions, the flashing is bedded on the chimney top with non-hardening sealant-adhesive, the 4-inch flex is screwed to the top adapter, fed down the flue and out through an opening cut in the masonry wall, and its lower end is screwed to the Retro Connector mounted on the masonry, which then receives the stove’s vent pipe.
Does my stove have to be approved for this?
Yes. DirectVent Pro is listed in combination with the appliance, so the stove manual must permit a masonry-chimney conversion and name DuraVent’s system; clearances come from the stove manual. The existing chimney must be sound, so have it inspected and cleaned before the liner goes in. It is for direct vent gas or propane stoves only.
What still has to be bought separately?
The 4-inch flex liner cut to the chimney height, the DirectVent Pro termination cap approved for the stove, and the black interior pipe and elbow between the stove and the Retro Connector. All are in the DirectVent Pro category. No sealant is needed on the twist-lock pipe joints unless the appliance manufacturer requires it.