DuraVent DuraChimney II 8 inch 30 Degree Elbow Kit: a bigger sidestep around rafters and joists
The DuraVent DuraChimney II 8 inch 30 Degree Elbow Kit is a pair of chimney bends with a support strap. This steeper kit takes the chimney farther sideways around an obstruction before returning it to vertical. Both elbows have a fixed 30 degree angle, the sharpest turn DuraChimney II permits. They cannot be combined into a steeper bend. The kit fits only 8 inch DuraChimney II pipe. Each pipe length between the elbows needs its own strap to hold it to the house framing, so the included strap may not be enough.
DuraChimney II is DuraVent’s air cooled chimney, a double wall pipe in 8 to 16 inch sizes for fireplaces that burn wood, oil, coal, or gas. The 8 inch parts form a separate family with twist lock joints. Plan for extra chimney height when using elbows. The cap must stand at least 3 feet above the roof exit and 2 feet above anything within 10 feet. Need a gentler turn? See the DuraVent DuraChimney II 8 inch 15 Degree Elbow Kit. The DuraVent DuraChimney II 8 inch 30 Degree Elbow Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 8DCA-E30K
Applications
DuraChimney II is a double-wall, air-cooled chimney system for use with masonry fireplaces which burn wood, oil, coal, or gas.
Materials and Construction
.016″ 430 stainless steel inner wall and .021″ galvanized steel outer wall. For stainless steel outer wall, contact Customer Service.
Unitized pipe sections. No field assembly of inners and outers required.
Clearances
2″ clearance to combustibles.
Shrouds
UL Listed with Duravent shroud specifications.
Diameters
8″
Listings
UL Listed to UL 103 and ULC S604 standards (MH7399).
FAQ
What comes in the 30-degree Elbow Kit for 8-inch DuraChimney II?
Two 30-degree elbows and one elbow strap for 8-inch DuraChimney II. One elbow turns the chimney out around the obstruction and the second brings it back to vertical, while the strap fastens the offset to the framing so the elbows do not carry the weight of the chimney above. The angle is fixed; DuraChimney II elbows are not adjustable.
Is 30 degrees the largest offset allowed?
Yes. UL 103 limits chimney offsets in the United States to 30 degrees, and DuraVent permits at most two offsets (four elbows) in one DuraChimney II installation. You cannot stack elbows to make a 45 or 60 degree turn. The offset chart in the DuraChimney II catalog lists the horizontal reach for 30 degree pairs with different pipe lengths between them.
How does an offset affect draft and chimney height?
Every offset restricts the natural draft, so DuraVent recommends 30 to 60 percent more chimney height than the 10 to 15 foot minimum above the fireplace outlet when elbows are used, and advises a straight vertical run wherever possible. A cold or offset chimney also forms more creosote, so plan on annual inspection and cleaning.
How is the offset supported?
Fasten the elbow strap from the kit around the pipe at the offset and screw it to the framing; DuraVent requires at least one strap per offset. Continue the normal supports above and below: a Wall Strap every 8 feet and a Supplementary Support where the total height exceeds 50 feet. Sections twist-lock, so no screws are normally needed at the elbows.
Will these elbows fit other DuraVent chimneys?
No. They are made for 8-inch DuraChimney II only; DuraVent does not allow DuraChimney II, DuraTech and DuraPlus components to be mixed. The 8-inch DuraChimney II line has its own instructions (L183) and the same 2-inch clearance to combustibles applies through the offset; 15-degree pairs are sold as a separate kit.