Vermont Casting 36LDVT 39LDVT, 43LDVT manual Support straps for horizontal runs

20' (6m)

(2.3m)	Pipe
	Straps Every
	3’ (914mm)
7.5'	Pipe Straps
	Every 3’ (914mm)
	Firestop/Zero
	Clearance Sleeve
	FP1012

Fig. 14 Support straps for horizontal runs.

Horizontal plane means no vertical rise exists on this portion of the vent assembly.

•The maximum number of 90° elbows per side wall installations is three (3).

•If a 90° elbow is fitted directly onto the fireplace flange the maximum horizontal vent run before the termination or a vertical rise is 36” (914mm).

•If a 90° elbow is used in the horizontal vent run (level height maintained) the maximum horizontal vent length is reduced by 36” (914mm). This does not apply if the 90° elbows are used to increase or redirect a vertical rise.

Example: According to the chart the maximum horizontal vent length in a system with a 7.5’ (2.3 m) vertical rise is 20’ (6m) and if a 90° is required in the horizontal vent it must be reduced to 17’ (5.2 m).

In Figure 16, Dimension A plus B must not be greater than 17’ (5.2 m).

3'

(914mm)

LDVT Series Direct Vent GaS Fireplace

A

B

7.5'	1 x 90° elbow in horizontal plane = 3’ (914mm)
(2.3m)
	A + B = 17' (5.2m) Max.
	FP1238

Fig. 16 Maximum vent run with elbows.

•The maximum number of 45° elbows permitted per side wall installation is two (2). These elbows can be installed in either the vertical or horizontal run.

•For each 45° elbow installed in the horizontal run, the length of the horizontal run MUST be reduced by 18” (457 mm). This does not apply if the 45° elbows are installed on the vertical part of the vent system.

•The maximum number of elbow degrees in a system is 270°. (Fig. 17)

Example:
Elbow 1	=	90°
Elbow 2	=	45°	4
Elbow 3	=	45°
Elbow 4	=	90°
Total angular variation	=	270°

1 + 2 + 3 + 4 = 270°

FP1237

1

3

2

FP1239

Fig. 15 Maximum horizontal vent run.

Fig. 17 Maximum number of elbow degrees.

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