Heat & Glo LifeStyle VRT-GY-P-AUB Vent Clearances and Framing, A. Pipe Clearances to Combustibles

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).

•If wall thickness is less than 4 in. (102 mm) the existing heat shields must be field trimmed.

B. Wall Penetration Framing

Combustible Wall Penetration

Whenever a combustible wall is penetrated, you must frame a hole for the wall shield firestop(s). The wall shield firestop maintains minimum clearances and prevents cold air infiltration.

•	The opening must be framed on all four sides using the
	same size framing materials as those used in the wall
	construction.
• SLP pipe - A wall shield firestop must be placed on each
	side of an interior wall. A minimum 1-1/2 inch (38 mm)
	overlap of attached heat shields must be maintained.
•	See Section 10.H for information for regarding the in-

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

stallation of a horizontal termination cap.

Non-Combustible Wall Penetration

If the hole being penetrated is surrounded by noncom- bustible materials such as concrete, a hole with diameter one inch 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.

WALL

Heat

Shield

Wall

Shield

Firestop

3 in. (76 mm) top clearance *

Heat

Shield

1 in. (25 mm) clearance bottom & sides

Note: A 6 in. (152 mm) section of straight flue must be attached to the fireplace before a 90° elbow.

* Unit shown with 1-1/2 ft. (457.2 mm) of vertical pipe. Vertical section will vary by gas. Refer to vent chart for minimum vertical.

WALL

* When using SLP pipe, minimum clearances from the vent pipe to combustible

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 Horizontal Venting Clearances To Combustible

Materials

10 in.

(254 mm)

10 in.

(254 mm)

A* B*

10in.

(254 mm)

10in.

(254 mm)

C

D

		A*	B*	C	D
VRT-N-AUB	Inches	69.3	34-3/4	68.3	33-3/4
	Millimeters	1761	883	1736	857
VRT-P-AUB	Inches	69.3	34-3/4	68.3	33-3/4
	Millimeters	1761	883	1736	857

*Shows center of vent framing hole for top or rear venting. The center of the hole is one 1 in. (25.4 mm) above the center of the horizontal vent pipe.

Figure 8.2 Wall Penetration

Heat & Glo • VRT-AUB • 2123-980 Rev. H • 5/12 37