Monessen Hearth HDV500NV/PV manual Maximum Three 3 90 Elb ows

Venting installation HDV Series Direct Vent Gas Fireplace

WARNING

When installing the appliance as a rear vent unit, the 90°, 45° transition elbow attached directly to the rear of the unit is NOT INCLUDED in the following criteria and calculations, and unless specifically mentioned should be ignored when calculating venting layouts.

•The maximum number of 90° elbows per side wall

installation is three (3). Figure 20

• If a 90° elbow is fitted directly on top of the fireplace	A: 10’	B: 7’
flange, the maximum horizontal vent run before the ter-
mination or a vertical rise is 36" (914 mm). Figure 21

3 x 90°

Elbows

3 x 90°

Elbows

Figure 20 -

Maximum Three (3) 90° Elbows

Per Installation

FP1176

36"

(914 mm)

Max.

36"

(914 mm)

Max.

Figure 21 -
Maximum Horizontal Run with No Rise	FP1177

•If a 90° elbow is used in the horizontal vent run (level height maintained) the horizontal vent length is reduced by 36" (914 mm) (Fig. 21 A and B) This does not apply if the 90° elbows are used to increase or redirect a vertical rise. Figure 22

Horizontal 90° Elbow = 3' Reduction

A + B = 17' Maximum

7’6”

Figure 22 -

Maximum Vent Run with Elbows

FP1959

Example: According to the vent graph (page 17) the maxi- mum horizontal vent length in a system with a 7.5' vertical rise is 20’ (6 m) and if a 90° elbow is required in the hori- zontal vent it must be reduced to 17' (5.2 m).

In Figures 22 and 24, Dimension A plus B must not be greater than 17' (5.2 m).

90°

AB

7’6”

FP2466

Figure 23 -

Horizontal Run Reduction

56D3048 19