DVF34, DVF34P
VENTING INSTALLATION
Continued
INSTALLATION FOR VERTICAL TERMINATION
1.Determine the route your vertical vent- ing will take. If ceiling joists, roof rafters, or other framing will obstruct the venting system, consider an offset (see Figure 20) to avoid cutting load bearing members. Note: Pay special attention to these installation instruc- tions for required clearances (air space) to combustibles when passing through ceilings, walls, roofs, enclosures, attic rafters, etc. Do not pack air spaces with insulation. Also note maximum verti- cal rise of the venting system and any maximum horizontal offset limitations. Offsets must fall within the parameters shown in Figure 8 on page 6.
2.Set the fireplace in desired location. Drop a plumb line down from the ceil- ing to the position of the fireplace exit flue. Mark the center point where the vent will penetrate the ceiling. Drill a small locating hole at this point.
Drop a plumb line from the inside of the roof to the locating hole in the ceil- ing. Mark the center point where the vent will penetrate the roof. Drill a small locating hole at this point.
Roof
Flashing
Wall Strap
45° Elbow
Ceiling Firestop
Figure 20 - Offset with Wall Strap and 45°
Flat Ceiling Installation
1.Cut a 10" square hole in the ceiling us- ing the locating hole as a center point. The opening should be framed to 10"x10" (254mm x 254mm) inside di- mensions, as shown in Figure 12 on page 9 using framing lumber the same size as the ceiling joists. If the area above the ceiling is an insulated ceil- ing or a room, nail firestop from the top side. This prevents loose insulation from falling into the required clearance space. Otherwise, install firestop below the framed hole. The firestop should be installed with no less than three nails per side (see Figure 21).
2.Assemble the desired lengths of pipe and elbows necessary to reach from the fireplace flue up through the firestop. All connections must be sealed with high temperature silicone sealant as specified in the second warning state- ment on page 7. Be sure all pipe and elbow connections are fully twist- locked (see Figure 11, page 9).
3.Cut a hole in the roof using the locating hole as a center point. (Cover any ex- posed open vent pipes before cutting hole in roof.) The 10"x10" hole must be measured on the horizontal; actual length may be larger depending on the pitch of the roof. There must be a 1" clearance from the vent pipe to combus- tible materials. Frame the opening as shown in Figure 12 on page 9.
If area above is a room, install firestop above framed hole.
If area above is not a room, install firestop below framed hole.
4.Connect a section of pipe and extend up through the hole.
Note: If an offset is needed to avoid obstructions, you must support the vent pipe every 3 feet. Use wall straps for
this purpose (see Figure 20). Whenever possible, use 45° elbows instead of 90° elbows. The 45° elbow offers less re- striction to the flow of the flue gases and intake air.
5.Place the flashing over the pipe section(s) extending through the roof. Secure the base of the flashing to the roof and framing with roofing nails. Be sure roofing material overlaps the top edge of the flashing as shown in Figure 20. There must be a 1" clearance from the vent pipe to combustible materials.
6.Continue to add pipe sections until the height of the vent cap meets the mini- mum building code requirements de- scribed in Figure 8 on page 6. Note: You must increase vent height for steep roof pitches. Nearby trees, adjoining rooflines, steep pitched roofs, and other similar fac- tors may cause poor draft or
7.
Note: If the vent pipe passes through any occupied areas above the first floor, including storage spaces and closets, you must enclose pipe. You may frame and sheetrock the enclo- surewithstandardconstructionmaterial.Make sure and meet the minimum allowable clear- ances to combustibles. Do not fill any of the required air spaces with insulation.
Cathedral Ceiling Installation
1.Remove shingles or other roof cover- ing as necessary to cut the rectangular hole for the support box. Mark the out- line of the cathedral ceiling support box on the roof sheathing using the locat- ing hole as a center point.
2.Cut the hole 1/8" larger than the sup- port box outline (see Figure 22, page 13).
Elbows
Figure 21 - Installing Firestop
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