Desa DVF36TCR, DVF36TCL, DVF36TCR, DVF36TCL, DVF36TCRP, DVF36TCLP Flat Ceiling Installation

Venting Installation

Instructions

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 21) to avoid cutting load bearing members.

Note: Pay special attention to these installa- tion 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 the vent- ing system and any maximum horizontal offset limitations. Offsets must fall within the parameters shown in Figure 22.

2.Set the fireplace in desired location. Drop a plumb line down from the ceiling to the posi- tion 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

	Plumber’s
(2) 45°	Tape
Elbows	Connected
	to Wall
	Strap
	Wall	(2) 45°
	Strap	Elbows
	Firestop	Firestop

Figure 21 - Vertical Vent Pipe Offsets

Lowest		Listed
Discharge
		Vent Cap
Opening
		8'
Listed			Minimum
Gas				X
Vent		12
					Roof Pitch is
					x 12 Listed
					Clearance
H (Min.) Height from Roof
	ROOF PITCH				H(Min.)
	Flat to 6/12				1.0'
	6/12 to 7/12				1.25'
	Over 7/12 to 8/12				1.5'
	Over 8/12 to 9/12				2.0'
	Over 9/12 to 10/12				2.5'
	Over 10/12 to 11/12				3.25'
	Over 11/12 to 12/12				4.0'
	Over 12/12 to 14/12				5.0'
	Over 14/12 to 16/12				6.0'
	Over 16/12 to 18/12				7.0'
	Over 18/12 to 20/12				7.5'
	Over 20/12 to 21/12				8.0'

Figure 22 - Vertical Vent Termination

Clearance

Flat Ceiling Installation

1. Cut a 10 3/4" square hole in the ceiling using the locating hole as a center point. The open- ing should be framed to 10 3/4"x10 3/4" inside dimensions, as shown in Figure 18 on page 13 using framing lumber the same size as the ceiling joists. If the area above the ceiling is an insulated ceiling or an attic space, nail firestop from the top side. This prevents loose insula- tion from falling into the required clearance space. If the area above the ceiling is a living space, install firestop below the framed hole. The firestop should be installed with no less than three nails per side (see Figure 23).

If area above is an attic, install firestop above framed hole.

If area above is a living space, install firestop below framed hole.

Figure 23 - Installing Firestop

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