Napoleon Fireplaces GDS28P manual Ht Vt

16

(HT) > (VT)

Simple venting configuration (only one 90° elbow)

See graph to determine the required vertical rise VT for the

required horizontal run HT.

147”

150

REQUIRED	100
VERTICAL
RISE IN
INCHES VT	57”
	50
	29”
	0	5	10	15	20
		2.83’		12.5’	19.5’

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT 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	90°	H1

H

Example 2:
V1	= VT = 6 FT
H1	= 3 FT				V1
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 FT
Formula 1:			HT	< 4.2 VT
Formula 2:			HT	4.2 VT = 4.2 x 6 = 25.2 FT
				+ VT < 24.75 FT

90°

2

16.7 < 24.75

Since both formulas are met, this vent configuration is acceptable.

Example 3:

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

90°

V1

H1 90°

H2 90°

90°

V2

H3

H4

Formula 1:	HT	< 4.2 VT
		4.2 VT	= 4.2 x 5.5 = 23.1 FT
	13.6 < 23.1

Formula 2: HT + VT < 24.75 FT 19.1 < 24.75

Since both formulas are met, this vent configuration is acceptable.

16.1_3A

W415-0153 / B / 06.10.10