Napoleon Fireplaces GD70PT-S, GD70NT-S Vertical Termination, Maximum, Rise, Feet, values for H

9

	VERTICAL TERMINATION
when (HT) > (VT)	For vent configurations requiring more than two 90°
Simple venting configurations
	elbow the following formulas apply:
FIGURE 10	Formula 1: HT < 3VT
	Formula 2: HT + VT < 40 feet
	Example 7:
	90°	90°
		V3
	V	H2
	1	V2
	H1	90°
		90°

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

19

20

FIGURE 11

MAXIMUM

VERTICAL

RISE

IN

10

FEET

3

V1

= 2 ft

VT

0

5

10

15

2

0

25

30

V2

= 1 ft

V3

= 1.5 ft

HORIZONTAL VENT RUN PLUS OFFSET IN FEET

T

V

= V + V + V = 2 + 1 + 1.5 = 4.5 ft

The shaded area within the lines represents acceptable

T

1

2

3

values for H

T

and V

T

.

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

= HR + HO= 8 + 8.1 = 16.1 ft

HT + VT = 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 20.6 < 40

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

W415-0434 / C / 03.24.05