VENT INSTALLATION

VERTICAL/HORIZONTAL TERMINATION CONFIGURATIONS (continued)

If a 90° elbow is used in the horizontal vent run (level height maintained) the horizontal vent length is reduced by 36". See Figures 11 and 12, page 17. This does not apply if the 90° elbows are used to increase or redirect a vertical rise. See Figure 14.

Example: According to the vent graph (page 16) the maximum horizontal vent length in a system with a 10' vertical rise is 20’ (6m) and if a 90° elbow is required in the horizontal vent it must be reduced to 17' (5.2 m).

In Figures 13 and 14 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" (45cm). 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°. See Figure 15.

 

90°

A

B

10'

Figure 13 - Horizontal Run Reduction

A 10'

7' B

Example:

Elbow 1

=

90°

 

Elbow 2

=

45°

 

Elbow 3

=

45°

 

Elbow 4

=

90°

Total Angular Variation

=

270°

1

2

3

4

90° Elbow = 3'

10'

A + B = 17' Maximum

Figure 14 - Maximum Vent Run with Elbows

24" Min.

1 + 2 + 3 + 4 = 270°

Figure 15 - Maximum Elbow Usage

18

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Monessen Hearth KHLDV SERIES manual VERTICAL/HORIZONTAL Termination Configurations, Horizontal Run Reduction

KHLDV SERIES specifications

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