12

VERTICAL TERMINATION

when (HT) < (VT)

Example 3:

Simple venting confi gurations

FIGURE 10

FIGURE 11

90°

H2

45°V1

45°

H1 90°

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

V2

90°

REQUIRED VERTICAL RISE

IN FEET (VT)

HORIZONTAL VENT RUN PLUS

OFFSETS IN FEET (HT)

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

For vent confi gurations requiring more than one 45º and one 90° elbow , the following formulas apply:

Formula 1: HT < VT

Formula 2: HT + VT < 40 feet

V1

= 5 ft

V2

= 10 ft

VT

= V1 + V2 = 5 + 10 = 15 ft

H1

= 3 ft

H2

= 2.5 ft

HR

= H1 + H2 = 3 + 2.5 = 5.5 ft

HO

= .03 (one 45º elbow + three 90º elbows - 135º)

 

= .03(45+90+90+90-135)=5.4

HT

= HR + HO = 5.5 + 5.4 = 10.9 ft

HT + VT

= 10.9 + 15 = 25.9 ft

Formula 1: HT < VT 10.9 < 15

Formula 2: HT + VT < 40 feet

25.9 < 40

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

W415-0326 / C / 11.23.07

Page 12
Image 12
Napoleon Fireplaces BGD48N, BGD48P manual Vertical Termination, = .0345+90+90+90-135=5.4, = HR + HO = 5.5 + 5.4 = 10.9 ft

BGD48N, BGD48P specifications

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