13

VERTICAL TERMINATION

when (HT) > (VT)

Simple venting confi gurations

FIGURE 12

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

REQUIRED

VERTICAL

R I S E I N

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

Formula 1: HT < 3VT

Formula 2: HT + VT < 40 feet

Example 4:

45°

H

 

90°

 

1

V2

 

 

H2

V1

90°

90°

FIGURE 13

V1

= 1 ft

V2

= 1.5 ft

VT

= V1 + V2 = 1 + 1.5 = 2.5 ft

H1

= 6 ft

H2

= 2 ft

HR

= H1 + H2 = 6 + 2 = 8 ft

HO

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

 

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

HT

= HR + HO = 8 + 5.4 = 13.4 ft

HT + VT

= 13.4 + 2.5 = 15.9 ft

Formula 1: HT <

3VT

 

3VT = 3 x 2.5 = 7.5 ft

13.4

> 7.5

Since this formula is not met, this vent confi guration is unac- ceptable.

Formula 2: HT + VT < 40 feet 15.9 < 40

Since only formula 2 is met, this vent confi guration is unac- ceptable and a new fi replace location or vent confi guration will need to be established to satisfy both formulas.

Example 5:

 

90°

H2

 

V2

 

 

 

 

45°

 

 

 

V1 45°

 

 

 

H1

H3

90°

 

 

90°

 

 

 

 

 

FIGURE 14

 

V1

= 1.5 ft

 

 

 

V2

= 8 ft

 

 

 

VT

= V1 + V2 = 1.5 + 8= 9.5 ft

 

 

H1

= 1 ft

 

 

 

H2

= 1 ft

 

 

 

H3

= 10.75 ft

 

 

 

HR

= H1 + H2 + H3 = 1 + 1 + 10.75 = 12.75 ft

 

HO

= .03 (three 90° elbows + two 45° elbow - 135°)

 

 

= .03(90 + 90 + 90 + 45 + 45 - 135) = 6.75 ft

 

HT

= HR + HO = 12.75 + 6.75 = 19.5 ft

 

HT + VT

= 19.5 + 4.5= 29 ft

 

 

Formula 1: HT < 3VT

3VT = 3 x 9.5 = 28.5 ft

19.5< 28.5

Formula 2: HT + VT < 40 feet

29 < 40

Since both formulas are met, this vent confi guration is accept- able.

W415-0327 / B / 12.07.07

Page 13
Image 13
Continental BCDV48N = .0345 + 90 + 90 + 90 135 = 5.4 ft, = H R + H O = 8 + 5.4 = 13.4 ft, + V T = 13.4 + 2.5 = 15.9 ft

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