12

REAR EXIT / HORIZONTAL TERMINATION

when (HT) > (VT)

Example 5:

Simple venting configuration (only two 90° elbows)

 

 

 

 

90°

 

90°

 

H4

FIGURE 13

 

V2

 

 

H2

 

45°

90°

 

 

 

 

H3

 

V1

 

 

H1

90°

 

 

 

 

 

FIGURE 14

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

REQUIRED

VERTICAL

RISE IN

INCHES

VT

HORIZONTAL VENT RUN PLUS OFFSETS IN FEET HT

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

For vent configurations requiring more than two 90° elbows the following formulas apply:

Formula 1: HT < 3.5VT

Formula 2: HT + VT < 24.75 feet

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 + one 45° elbow - 90°)

 

= .03(90 + 90 + 90 + 90 + 45 - 90) = 9.45 ft

HT

= HR + HO = 5.5 + 9.45 = 14.95 ft

HT + VT

= 14.95 + 5.5 = 20.45 ft

Formula 1: HT < 3.5VT

3.5VT = 3.5 x 5.5 = 19.25 ft

14.95 < 19.25

Formula 2: HT + VT < 24.75 feet

20.45 < 24.75

Since both formulas are met, this vent configuration is ac- ceptable.

W415-0210 / E / 06.25.03

Page 12
Image 12
Napoleon Fireplaces BGD36NTR, BGD36PTR manual Formula 1 HT 3.5VT Formula 2 HT + VT 24.75 feet

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