TOP EXIT VERTICAL termination

when (Ht) < (Vt)

See graph to determine the

required vertical rise VT for the required horizontal run HT.

figure 9

required vertical rise in feet

VT

horizontal vent run PLUS OFFSET in

feet HT

The shaded area within the lines represents ac- ceptable values for HT and VT .

For vent configurations requiring more than zero 90° elbow (top exit) or one 90° elbow (rear exit), the following formulas apply:

Formula 1: HT < VT

Formula 2: HT + VT < 40 feet

TOP VERTICAL termination

when (Ht) > (Vt)

Simple venting configurations

figure 10

90°

 

 

 

 

 

90°

V3

 

 

 

 

V

 

V H2

 

H1

 

 

1

2

 

 

 

 

 

 

 

9

90°

 

 

 

 

figure 11

See graph to determine the required vertical rise VT for the required horizontal run HT.

maximum vertical rise in feet

VT

horizontal vent run PLUS OFFSET in feet HT

The shaded area within the lines represents acceptable values for HT and VT .

For vent configurations requiring more than two 90° elbow (top exit) or one 90° elbow (rear exit), the following formulas apply:

Formula 1: HT < 3VT

Formula 2: HT + VT < 40 feet

Example 7:

V1

=2 ft

V2

=1 ft

V3

 

=1.5 ft

VT

 

= V1 + V2 + V3 = 2 + 1 + 1.5 = 4.5 ft

H1

 

=6 ft

H2

 

=2 ft

HR

 

= H1

+ H2 = 6 + 2 = 8 ft

HO

 

= .03(four 90° elbows - 90°)

 

 

= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft

HT

+ VT

=HR + HO = 8 + 8.1 = 16.1 ft

HT

= 16.1 + 4.5 = 20.6 ft

Formula 1:

HT < 3VT

 

 

 

3VT = 3 x 4.5 = 13.5 ft

 

 

 

16.1 > 13.5

Since this formula is not met, this vent configuration is unacceptable.

Formula 2: HT + VT < 40 feet 0.6 < 40

Since only formula 2 is met, this vent configuration is unacceptable and a new fireplace location or vent configuration will need to be established to satisfy both formulas.

W415-0536 / C / 09.06.06

Page 9
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Napoleon Fireplaces GD82NT, GD82PT manual TOP Exit Vertical termination, TOP Vertical termination

GD82PT, GD82NT specifications

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