VENTING INSTALLATION
Installation for Vertical Termination
13
VENTING INSTALLATION
Continued
INSTALLATION FOR VERTICAL
TERMINATION
NOTICE: Use rigid pipe only. Flex venting is not to be used with a vertical termination.
1.Determine the route your vertical venting will take. If ceiling joists, roof rafters, or other framing will obstruct the venting system, consider an offset (see Figure 24) to avoid cutting loadbearing members. Note: Pay special attention to these in- stallation instructions for required clearances (air space) to com- bustibles when passing through ceilings, walls, roofs, enclo- sures, attic rafters, etc. Do not pack air spaces with insulation. Also note maximum vertical rise of the venting system and any maximum horizontal offset limitations. Offsets must fall within the parameters shown in Figure 13 on page 8.
2.Set the fireplace in desired location. Drop a plumb line down from the ceiling 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 ceiling. 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
Flat Ceiling Installation
1.Cut a 10" square hole in the ceiling using the locating hole as a center point. The opening should be framed to 10"x10" (254mm x 254mm) inside dimensions, as shown in Figure 17 on page 11 using framing lumber the same size as the ceiling joists. If the area above the ceiling is an insulated ceiling 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 25).
2.Assemble the desired lengths of pipe and elbows necessary to reach from the fireplace flue up through the firestop. All con- nections must be sealed with high temperature silicone sealant as specified in the second warning statement on page 9. Be sure all pipe and elbow connections are fully
3.Cut a hole in the roof using the locating hole as a center point. (Cover any exposed 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 combustible materials. Frame the opening as shown in Figure 17 on page 11.
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 24). Whenever possible, use 45° elbows instead of 90° elbows. The 45° elbow offers less restriction 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 24. 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 minimum building code requirements described in Figure 13, page 8. Note: You must increase vent height for steep roof pitches. Nearby trees, adjoining rooflines, steep pitched roofs, and other similar factors may cause poor draft or
If area above is a room, install firestop above framed hole.
Ceiling Firestop
If area above is not a room, install firestop below framed hole.
Figure 24 - Offset with Wall Strap and 45° Elbows
Figure 25 - Installing Firestop
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