Vermont Casting DVRT41 manual Total angular variation 270, Maximum vent run with elbows

DVRT41 Direct Vent Gas Fireplace

•The maximum number of 90° elbows per side wall installation is three (3). (Fig. 2)

•If a 90° elbow is fitted directly on top of the fireplace flange the maximum horizontal vent run before the termination or a vertical rise is 36” (914mm). (Fig. 27)

		7'
A	10'	(178 cm) B
	(254 cm)
		A + B = 17’
8'		(518cm) Max.

3 x 90° Elbows

3 x 90°

Elbows

FP1176

(244 cm)

V584-201

Fig. 29 Maximum vent run with elbows.

In Figure 28 & 29, dimension A plus B must not be greater than 17’ (5.2m)

• The maximum number of 45° elbows permitted per

side wall installation is two (2). These elbows can

Fig. 26	Maximum three (3) 90° elbows per installation.
	36"
	(914mm)
	Max.
	36"
	(914mm)
	Max.
	FP1177
Fig. 27	Maximum horizontal run with no rise.

•If a 90° elbow is used in the horizontal vent run (level height maintained) the horizontal vent length is reduced by 36” (914mm). (Fig. 28 & 29) This does not apply if the 90° elbows are used to increase or redirect a vertical rise. (Fig. 26)

Example: According to the vent graph (Page 13) the maximum horizontal vent length in a system with a 7¹⁄₂’ (2.3m) rise is 20’ (6m) and if a 90° elbow is required in the horizontal vent it must be reduced to 17’ (5.2m).

AB

A + B = 17’ (Max.)

(5.2m)

7’6"

(2.3m)

FP1178

Fig. 28 Horizontal run reduction.

16

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” (457mm). 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 sys-

tem is 270°. (Fig. 30) Example:

	Elbow 1	=	90°
	Elbow 2	=	45°
	Elbow 3	=	45°
	Elbow 4	=	90°
Total angular variation		=	270°
	1 + 2 + 3 + 4 = 270°
1			1
2			2
3			3
4			4
			FP1180
Fig. 30	Maximum elbow usage.
			10006740