Two-sided (See-through):
Multiply the height "B" by the width "A" to find the are
of the opening on one side. Add 50% (multiply the area
by 1.5) and use this adjusted area to find the appropri-
ate column.
Three-sided (corner installation):
To determine the area of a three-sided fireplace,
find the length of diagonals, "A" and "B". Add "A" and
"B" and multiply the sum by "C" (all measures in
inches).
There are two ways to determine the chimney fan
type and size for a specific application.
One alternative is to calculate the flue gas volume
and the flow resistance and then select a chimney fan
that meets the calculated requirements. This is nor-
mally referred to as an "engineered system". For
directions on how to do a manual calculation, please
refer to Appendix A.
However, most applications are relatively simple
and are covered by the selection charts on page 11 and
12.
The selection charts are based on the following
assumptions:
Height of chimney:
15-30 ft.
Flue gas temperature (fuel):
Wood:
300°F
Natural Gas:
200°F
Frontal inlet velocity:
Fireplaces (wood)
48 FPM
Fireplaces (gas)
36 FPM
See-through (wood)
72 FPM
See-through (gas)
54 FPM
Free-standing
96 FPM
Stoves
72 FPM
Pizza ovens
84 FPM
Fireplaces
The first step is to determine the area of fireplace
opening. Follow these directions:
One-sided:
Determine the fireplace opening area by multiplying
width "A" and height "B" (all measures in
inches).
EXHAUSTO
S
ECTION
4: H
OW
T
O
S
ELECT
C
HIMNEY
F
AN
B
A
A
B
C
A
B
Fig. 6
Fig. 7
Fig. 8
9
Summary of Contents for EXHAUSTO RS 12
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