Vermont Casting DVBR42, DVBR36 manual Total angular variation 270, Horizontal run reduction

DVBR Series Direct Vent Gas Fireplace

3 x 90°	3 x 90°
Elbows	Elbows

FP1176
Fig. 26	Maximum three (3) 90° elbows per installation.
	36"
	(914mm)
	Max.
	36"
	(914mm)
	Max.
	FP1177
Fig. 27	Maximum horizontal runwith 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 15) the maximum horizontal vent length in a system with a

7¹⁄₂” (191mm) rise is 20” (508mm) and if a 90° elbow is required in the horizontal vent it must be reduced to 17’ (5.2m).

90o

AB

A + B = 17' (Max.)

7'6"

FP1178

Fig. 28 Horizontal run reduction.

		7’
	A	(178cm)
	10’
	(254cm)	B
	A + B = 17’ Max.
8’
(244cm)
		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 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 system 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.

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