Napoleon Fireplaces BGD90PT, BGD90NT manual TOP Exit Vertical Termination, TOP Vertical Termination

8

TOP EXIT VERTICAL TERMINATION

when (HT) < (VT)

FIGURE 9

REQUIRED VERTI-

CAL RISE IN 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 zero 90° elbow (top exit) or one 90° elbow (rear exit), the following formulas apply:

See graph to determine the required vertical rise VT	for the	Formula 1: HT < VT
		Formula 2: HT	+ VT	< 40 feet
required horizontal run HT.

TOP VERTICAL TERMINATION

when (HT) > (VT)

Simple venting confi gurations

FIGURE 10

Formula 1: HT < 3VT

Formula 2: HT + VT < 40 feet

Example 7:

V1	=2 ft
V2	=1 ft
V3	=1.5 ft

FIGURE 11

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

For vent confi gurations requiring more than two 90° elbow (top exit) or one 90° elbow (rear exit), the following formulas apply:

MAXIMUM

VERTICAL

RISE IN

FEET

VT

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

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

W415-0614 / A / 07.24.07

VT	= V1 + V2 + V3 = 2 + 1 + 1.5 = 4.5 ft
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 confi guration is unacceptable and a new fi replace location or vent confi guration will need to be established to satisfy both formulas.