Air-Cooled, All-Fuel Chimney for Fireplaces DuraChimney ii Installation Instructions
A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE THAT DuraChimney II BE INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. NOTE: Read through all of these instructions before beginning your installation. Failure to install as described in this instruction will void the manufacturer’s warranty, and may have an effect on your homeowner’s insurance and UL listing status.
For the most up-to-date installation instructions, see www.duravent.com CONTENTS DuraChimney ii Air-cooled, all-fuel chimney for fireplaces Clearances | Permits | Applications | Equipment | Installation Notes . . . . 4 Chimney Diameter | Chimney Height | Requirements | Recommendations . . 5 Masonry Fireplace Installation | Frame Opening Chart. . . . . . . . . . . . . . . . 6 Chimney Sizing Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DuraChimney is designed to stay cool on the outside, to provide a hot draft on the inside, and to provide for a fire-safe design that protects both the chimney and the building. The double-wall air-cooled design allows the chimney to expand under high temperatures. Applications DuraChimney II is listed to UL 103 and ULC S604 standards for use on masonry fireplaces which burn wood, oil, coal, or gas. Some factory-built fireplaces may be listed with DuraChimney II.
EQUIPMENT & MATERIALS Drill / Driver Hammer Caulking Gun Plumb Bob Screwdrivers (Phillips & Standard) Tin Snips Saber or Keyhole Saw Level Dependable Ladder Tape Measure Proper Gloves and Shoes Eye Protection Materials You May Need: Non-hardening Waterproof Sealant 8-Penny Nails, 600°F RTV Silicone Sealant Roofing Nails #8, 2-1/2” & 1-1/2” Wood Screws INSTALLATION NOTES Proper planning for your DuraChimney II installation will result in greater safety, efficiency, and convenience, as well as savin
Table 1 Frame Opening Dimension Chart Diameter Framing Dimension 10" 17" x 17" 12" 19" x 19" 14" 21" x 21" 16" 23" x 23" ANCHOR PLATE OR ANCHOR PLATE WITH DAMPER MASONRY ANCHORS HI-TEMP SEALANT pass through floors of buildings requiring the protection of vertical openings shall be enclosed with approved walls having a fire resistance rating of not less than one hour when such chimneys are located in a building less than 4 stories in height, and not less than 2 hours when such chimneys are locat
according to the fireplace manufacturer’s installation instructions. The flue outlet should be placed between the rafters or joists above, if possible. 2. Determine Chimney Size: Follow the fireplace manufacturer’s instructions for chimney size or use Table 2 (pg 11) to determine the correct diameter chimney for your fireplace. 3. Mount Anchor Plate: Chimneys for masonry fireplaces begin with an Anchor Plate or Anchor Plate with Damper.
tension is needed to prevent the damper plate from rattling when closed. Mount the Lintel Hook to the masonry with the screws provided. 4. Attach Chimney: Attach the first Chimney Section onto the Anchor Plate by using the sheet metal screws provided. Always maintain at least a 2-inch clearance to combustibles. The 2-inch clearance is an air space; do not fill that clearance space with any materials. If an offset is required, refer to the Elbow Offset Installation Section below. 5.
installed on the underside of the ceiling/floor framing (Fig. 5). Use a minimum of either (1) 8 penny nail or (1) 1-1/4” wood screws per corner. 8. Assemble Chimney Sections: Chimney sections are connected by lowering the female end of a Chimney Section onto the male end of a previous section of chimney. Sheet metal screws are required to connect Chimney Section together. For each additional Chimney Section use (4) Sheet metal screws provided, to make a secure connection between the chimney sections (Fig.
(4) ROOF RADIATION SHIELDS Figure 11 CHASE ENCLOSURE 1/2 INCH MINIMUM AIR SPACE ESTABLISHED BY SPACERS 1/2 INCH AIR SPACE CHASE TOP FLASHING REQUIRED SPACERS 1/2 " Figure 12 1 1/2” VENTILATION OPENING AROUND CHIMNEY PIPE Figure 13 10 enclose the attic portion of the chimney in a framed enclosure (always maintain 2” air-space clearance to combustibles). If the chimney is fully enclosed through the attic, an Attic Insulation Shield is not required. Install the Attic Insulation Shield as follows: a.
Table 2 Chimney Sizing Chart for Fireplace Installations Dotted line represents sample problem. Example shows fireplace opening as 36" wide and 30" high, and the chimney height as 20'. The correct flue size for the sample is 12" diameter pipe.
SEALANT CHASE TOP COLLAR SCREW OR POP-RIVET Figure 14 SEALANT 6" MIN. 3' MINIMUM ABOVE ROOF OPENING STORM COLLAR Figure 15 TERMINATION CAP Figure 16 12 member and secure in place with screws or nails. 12. Attach Flashing: For chase enclosures, use a Chase Top Flashing. The Chase Top Flashing allows for a 1-1/2” clearance maintained from the chimney and provides required ventilation air.
installed 1” off the Chase Top Flashing to provide proper ventilation (Fig. 15). Tighten the bolts of the Storm Collar and seal the Storm Collar against the Chimney with sealant. Be sure Chimney and Offsets are properly supported. Attach the Chimney Cap onto the top of the chimney by setting the female end of the Cap onto the male end of the last Chimney Section. Secure the Cap by using (4) sheet metal screws provided (Fig. 16). Do not push down from the top portion of the cap as this may damage the cap.
Table 3 DuraChimney II Elbow Offset Chart Elbow Angle From Vertical Chimney Length Between Elbows Offset Inches Rise Inches Offset Inches Rise Inches Offset Inches Rise Inches Offset Inches Rise Inches 15° 0" 2 ⁹/₁₆ 20 ⁵/₈ 2 ⁵/₈ 21 ⁵/₈ 2 ⁵/₈ 21 ⁵/₈ 2¾ 21 ¹/₈ 15° 12" 5 ³/₈ 31 ¼ 5½ 31 ¾ 5½ 32 ¼ 5 ⁵/₈ 32 ¾ 15° 18" 7 37 7 37 ½ 7 ¹/₈ 38 7 ¹/₈ 36 ½ 15° 36" 11 ⁵/₈ 54 ½ 11 ⁵/₈ 55 11 ¾ 55 ³/₈ 11 ¾ 55 ⁷/₈ 15° 48" 14 ¾ 66 14 ¾ 66 ½ 14 ⁷/₈ 67 14 ⁷/₈ 67 ½ 30°
appropriate length (or lengths) of Chimney Section(s) above the Elbow. Attach the second Elbow above the Chimney Section to complete the offset (Fig. 17). 2. Secure Offset: Use an Elbow Strap to secure the offset. Secure the Elbow Strap’s band to chimney around the upper portion of the top Elbow, then tighten the nut and bolt until the clamp is firm. Wrap the Elbow Strap end over an adjacent joist or rafter and secure it with at least two 8-penny nails or #8, 1-1/2” screws.
M&G DuraVent Warranty M&G DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products to the original purchaser, with the exception of Ventinox (lifetime), DuraBlack (five years) and all Termination Caps (five years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from substantial defects in material or manufacturing, if properly installed, maintained and used.