Venting Installation
Continued
Installation for vertical termination
Note: Vertical restrictor must be installed in all vertical installations.
1.Determine route your vertical venting will take. If ceiling joists, roof rafters or other framing will obstruct venting system, consider an offset (see Figure 19) to avoid cutting load bearing members.
Note: Pay special attention to these instal- lation instructions 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 vertical rise of venting system and any maximum horizontal offset limitations.
2.Set fireplace in desired location. Drop a plumb line down from ceiling to position of fireplace exit flue. Mark center point where vent will penetrate ceiling. Drill a small locating hole at this point.
Drop a plumb line from inside of roof to locating hole in ceiling. Mark center point where vent will penetrate roof. Drill a small locating hole at this point.
Flat Ceiling Installation
1.Cut a 11 1/2" square hole in ceiling using locating hole as a center point. Opening should be framed to 11 1/2" x 11 1/2" inside
Roof Flashing
Wall Strap
45° Elbow
Ceiling Firestop
Figure 19 - Offset with Wall Strap and 45°
Elbows
dimensions, as shown in Figure 9 on page 10 using framing lumber the same size as ceiling joists. If area above ceiling is an insulated ceiling or an attic, nail firestop from top side. This prevents loose insulation from falling into required clearance space. If area above ceiling is a living space, install firestop below framed hole. Firestop should be installed with no less than three nails per side (see Figure 20).
2.Assemble the desired lengths of pipe and elbows necessary to reach from fireplace flue up through firestop. Be sure all pipe and elbow connections are fully twist- locked (see Figure 8, page 10).
3.Cut a hole in roof using locating hole as a center point. (Cover any exposed open vent pipes before cutting hole in roof.) The 11 1/2" x 11 1/2" hole must be measured on the horizontal; actual length may be larger depending on pitch of roof. There must be a 1" clearance from vent pipe to combustible materials. Frame opening as shown in Figure 9, page 10.
4.Connect a section of pipe and extend up through hole.
Note: If an offset is needed to avoid obstructions, you must support vent pipe every 3 feet. Use wall straps for this pur- pose (see Figure 19). Whenever possible, use 45° elbows instead of 90° elbows. A
45° elbow offers less restriction to the flow of flue gases and intake air.
If area above is an attic or insulated area,
install firestop above framed hole.
If area above is a living space, install
firestop below framed hole.
Figure 20 - Installing Firestop
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