7

TOP EXIT / HORIZONTAL TERMINATION

when (HT) > (VT)

Simple venting confi guration (only one 90° elbow)

FIGURE 6

See graph to determine the required verti- cal rise VT for the required horizontal run HT.

V1

= VT = 6 ft

H1

= 3 ft

H2

= 5 ft

HR

= H1 + H2 = 3 + 5 = 8 ft

HO

= .03 (two 90° elbows - 90°) = .03(180° - 90°) = 2.7

ft

 

HT

= HR + HO = 8 + 2.7 = 10.7 ft

HT + VT= 10.7 + 6 =16.7

Formula 1: HT < 4.2 VT

4.2VT = 4.2 x 6 = 25.2 ft

10.7< 25.2

Formula 2: HT + VT < 24.75 feet

16.7 < 24.75

Since both formulas are met, this vent confi guration is ac-

REQUIRED VERTICAL RISE IN

ceptable.

 

90°

H1

H4

V2

 

INCHES

VT

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

V1

Example 3:

90°

H2 H3

FIGURE 8

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

For vent configurations requiring more than one 90° elbow the following formulas apply:

Formula 1: HT < 4.2 VT

Formula 2: HT + VT < 24.75 feet

Example 2:

H1

H2

V1 90°

FIGURE 7

V1

= 4 ft

V2

= 1.5 ft

VT

= V1 + V2 = 4 + 1.5 = 5.5 ft

H1

= 2 ft

H2

= 1 ft

H3

= 1 ft

H4

= 1.5 ft

HR

= H1 + H2 + H3 + H4 = 2 + 1 + 1 + 1. 5 = 5.5 ft

HO

= .03 (four 90° elbows - 90°) = .03(360° - 90°) = 8.1

ft

 

HT

= HR + HO = 5.5 + 8.1 = 13.6 ft

HT + VT = 13.6 + 5.5 = 19.1 ft

Formula 1: HT < 4.2 VT

4.2VT = 4.2 x 5.5 = 23.1 ft

13.6< 23.1

Formula 2: HT + VT < 24.75 feet

19.1 < 24.75

W415-0583 / B / 05.23.07

Page 7
Image 7
Napoleon Fireplaces GD82NT-T HT + VT= 10.7 + 6 =16.7, VT = 4.2 x 6 = 25.2 ft, Ceptable, HT + VT = 13.6 + 5.5 = 19.1 ft

GD82NT-T, GD82PT-T specifications

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