Monessen Hearth CDV7 manual Maximum number of 90 elbows per side wall

Venting installation

CDVSC7 & CDV7 Series Gas Fireplace

3 x 90°	3 x 90°
Elbows	Elbows

A

B

FP1176		A + B = 17’ (Max.)
		(5.2m)
Figure 21 -
Maximum three (3) 90° elbows per installation		7’6"
36"		(2.3m)
(914mm)	FP1178	Figure 23 -
Max.
		Horizontal Run Reduction
36"
(914mm)
Max.
		B 7’
		(2.1 m)
	A	10’
		(3 m)
FP1177
Figure 22 -
Maximum horizontal run with no rise

• The maximum number of 90° elbows per side wall in-

stallation is three (3). Figure 21

• If a 90° elbow is fitted directly on top of the fireplace

flange the maximum horizontal vent run before the ter-

mination or a vertical rise is 36” (914 mm). Figure 22

• If a 90° elbow is used in the horizontal vent run (level

height maintained) the horizontal vent length is re-

duced by 36” (914 mm). Figures 22 & 23. This does

7’6"

(2.3 m)

Figure 24 -

Maximum Vent Run with Elbows

not apply if the 90° elbows are used to increase or

redirect a vertical rise. Figure 21

Example: According to the vent graph (Page 15) the maximum horizontal vent length in a system with a 7Z\x’ (2.3 m) 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).

In Figures 24 & 25, dimension A plus B must not be great- er than 17’ (5.2m)

• The maximum number of 45° elbows permitted per in-

stallation is six (6). 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°. Figure 25

V584-201

1 + 2 + 3 + 4 = 270°

1

2

3

4

1

2

3

4

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

FP1180

Figure 25 -

Maximum Elbow Usage

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