Desa TSTA-A(-HA) Continued, Vertical Vent Termination Clearance, Flat Ceiling Installation

Venting Installation

Instructions

Continued

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 25.

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.

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 25 - Vertical Vent Termination

Clearance

Flat Ceiling Installation

1. Cut a 12 1/2" square hole in the ceiling using the locating hole as a center point. The open- ing should be framed to 12 1/2"x12 1/2" 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, 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 26).

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 statement on page 11. Be sure all pipe and elbow connections are fully twist-locked (see Figure 17, page 13).

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 12 1/2" x 12 1/2" 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 18 on page 13.

4. Connect a section of pipe and extend up through the hole. 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, page 15). 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.

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

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

Figure 26 - Installing Firestop

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