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-AUB2123-980 Rev. H • 5/12

37

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

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