TOP or Rear Exit Vertical Termination

(HT) < (VT)

Simple venting conﬁgurations

Example 6:

FIGURE 16

FIGURE 17	V3
	V3
	90°

							90°	V2
							90°	H2
								H2
							V1	H1	90°
								90°
	See graph to determine the required vertical rise VT for the
	required horizontal run HT.				V1	=5 ft
					V	=6 ft
	40				V32	=10 ft
REQUIRED					VT	= V1 + V2 + V3 = 5 + 6 + 10 = 21 ft
VERTICAL RISE					VT	= V1 + V2 + V3 = 5 + 6 + 10 = 21 ft
IN FEET					H1	=8 ft
VT					H	=2.5 ft
VT	30				HR2	= H1	+ H2 = 8 + 2.5 = 10.5 ft
					HO	= .03 (four 90° elbows - 90°)
						= .03 (90 + 90 + 90 + 90 - 90) = 8.1 ft
					HT	=HR + HO		= 10.5 + 8.1 = 18.6 ft
	20				HT + VT	= 18.6 + 21 = 39.6 ft
					Formula 1:		HT < VT
							18.6 < 21
	10				Formula 2:		HT + VT < 40 feet
	10						39.6 < 40
	3				Since both formulas are met, this vent conﬁguration is
	3				acceptable.
					acceptable.
	0	5	10	15	20
	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 zero 90° elbow (top exit) or one 90° elbow (rear exit), the following formulas apply:

Formula 1: HT < VT

Formula 2: HT + VT < 40 feet

W415-0607 / A / 01.18.08

GDS26P, GDS26N specifications

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Napoleon Fireplaces GDS26N, GDS26P TOP or Rear Exit Vertical Termination, HR2, Ht + Vt, Ht Vt

Models: GDS26P GDS26N