14 | VENTING INSTALLATION INSTRUCTIONS |
Installation for Vertical Terminations |
VENTING INSTALLATION
INSTRUCTIONS
Continued
Note: Vertical restrictor must be installed in all vertical installations.
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 26) to avoid cutting load bearing members. NOTE: Pay special attention to these instal- lation 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 horizontal offset limitations.
2.Set 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
Ceiling Firestop
Figure 26 - Offset with Wall Strap and 45° Elbows
2.Assemble the desired lengths of pipe and elbows necessary to reach from the fireplace flue up through the firestop. 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 ¾” x 10 ¾” hole must be measured on the horizontal; actual length may be larger dependiong 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 12, page 9.
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 26). Whenever possible, use 45º elbows instead of 90º elbows. The 45º 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 fram- ing with roofing nails. Be sure roofing material overlaps the top edge of the flashing as shown in Figure 26. There must be a 1” clearnace from the vent pipe to combustible materials
6.Continue to add pipe section until the height of the vent cap meets the minimum building code requirements described in Figure 10 on page 7. 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
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 enclosure with standard construction material. Make sure and meet the minimum allowable clearances to combustibles. Do not fill any of the required air spaces with insulation.
If area above is a room, install | If the area above is not a room, install |
firestop above framed hole. | firestop below framed hole. |
Flat Ceiling Installation
1. Cut a 10 ¾” square hole in the ceiling using the locating hole as
a center point. The opening should be framed to 10 ¾” x 10 ¾” (273 mm x 273 mm) inside dimensions, 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 ceiling or a room, nail firestop from the top side. This prevents loose insula-
tion from falling into the required clearance space. Otherwise, Figure 27 - Installing Firestop install firestop below the framed hole. The firestop should be
installed with no less than three nails per side (see Figure 27).
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