Hearth and Home Technologies NDV3630 Vent Clearances and Framing, B. Wall Penetration Framing

8 Vent Clearances and Framing

A. Pipe Clearances to Combustibles

WARNING! Risk of Fire! Maintain air space clearance to vent. DO NOT pack insulation or other combustibles:

•Between ceiling firestops

•Between wall shield firestops

•Around vent system

Failure to keep insulation or other material away from vent pipe may cause over heating and fire.

Note: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm).

•DVP heat shield - designed to be used on a wall 4 in. to 7-1/4 in. (102 mm to 184 mm) thick.

•If wall thickness is less than 4 in. the existing heat shields must be field trimmed. If wall thickness is greater than 7-1/4 in. a DVP-HSM-B will be required.

•SLP heat shield - designed to be used on a wall 4-3/8 in. to 7-5/8 in. (111 mm to 194 mm thick).

•If wall thickness is less than 4-3/8 the existing heat shields must be field trimmed. If wall thickness is greater than 7-5/8 in. a DVP-HSM-B will be required.

(DVP-SLP Pipe Shown)

B. Wall Penetration Framing

Combustible Wall Penetration

Frame a hole in a combustible wall for an interior wall shield firestop, (Figure 8.2) whenever a wall is penetrated.

The opening must be framed on all four sides using the same size framing materials as those used in the wall construction. The wall shield firestop maintains minimum clearances and prevents cold air infiltration.

Non-Combustible Wall Penetration

If the hole being penetrated is surrounded by noncombus- tible materials such as concrete, a hole with diameter 1 in. greater than the pipe is acceptable.

Whenever a non-combustible wall is penetrated, the wall shield firestop is only required on one side and no heat shield is necessary.

If your local inspector requires the wall shield firestop on both sides, then both wall shield firestops must have a heat shield attached to them.

3 in. (76 mm) top clearance

1 in. (25 mm) clearance around vertical sections

Heat

Shield

Wall

Shield

Firestop

3 in. (76 mm) top clearance *

Heat

Shield

1 in. (25 mm) clearance bottom & sides

12 in.

The center of the framing hole is

10 in.	Vent framing hole.
	DO NOT PACK WITH
	INSULATION OR
	OTHER MATERIAL.

WALL

1 in. (25mm) above the center of the horizontal vent pipe.

Heat Shield

3 in. (76 mm) top clearance *

Heat

Shield

Framing should be constructed of 2 X 4 lumber or heavier.

A*

B*

Wall

Shield

Firestop

1 in. (25 mm) clearance bottom & sides

* To center of pipe.

	A	B
Model	Top Vent	Rear Vent

WALL

*When using SLP pipe, minimum clearances from the vent pipe to combus- tible materials at inside wall firestops are: Top: 2-1/2 in. (64 mm)

Bottom: 1/2 in. (13 mm)

Sides: 1 in. (25 mm)

Figure 8.1 Pipe Clearances

NDV3630	in.	39-1/2	23-1/2
NDV3933
NDV4236	mm	1003	597
NDV4842

Figure 8.2 Wall Penetration DVP only

Heatilator • Novus NDV Series • 4055-187 Rev F • 06/08 33