Vermont Casting DVR33 manual Max 914 mm

Vermont Castings, Majestic Products: DVR33

Max. 3' (914 mm)

Fig. 21 Maximum horizontal run with no rise.

•If a 90˚ elbow is used in the horizontal vent run (level height maintained), the maximum horizontal vent length is reduced by 36” (914 mm) (Fig. 22). This does not apply if the 90˚ elbows are used to increase or redirect a vertical rise (Fig. 20).

Example: According to the vent graph (page 14), the maximum horizontal vent length in a system with a 7.5’ (2.3 mm) vertical rise is 20’ (6 m), and if a 90˚ elbow is required in the horizontal vent, it must be reduced to 17’ (5.2 m).

		“B”
	“A”	7’
	10’	(2134 mm)
	(3048 mm)
	90° Elbow = 3’
7’6”	A + B = 17’ (5.2 m) max.
(2286 mm)
	Redirected
	vertical rise
		V584-201
Fig. 22	Maximum vent run with elbows.

As shown in Fig. 22, the total of dimension A and B is not to be greater than 17’ (5.2 m).

•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” (45 cm). 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. 23).

Example:

Elbow 1	=	90˚
Elbow 2	=	45˚
Elbow 3	=	45˚
Elbow 4	=	90˚
Total angular variation	=	270˚
1 + 2 + 3 + 4 = 270º
Elbow 4
Elbow 3
Elbow 2
Elbow 1
		Ignore
		Transition
		Elbow

Fig. 23 Maximum elbow usage.

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