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TAKE MEASUREMENTS
Interior Blower Installation
SIDE VIEW
OF DOWNDRAFT
PLAN THE DUCTWORK
Interior Blower Installation
1. The interior
downdraft blower
system is designed
for use with 3-1/4" x
10" ductwork (can be
transitioned to 6"
round). Three
different discharge
directions are
available with side-to-
side adjustment for
accurate alignment of
ductwork.
2. For best performance:
Choose the ducting
option which allows
the shortest length of
ductwork and a
minimum number of
elbows and transitions. Check location of floor joists, wall
studs, electrical wiring or plumbing for possible interfer-
ence.
3-1/4" X 10" TO 6" RD.
6" ROUND
TRANSITION
ELBOW
EQUALS
EQUALS 8 FT. OF
2 FT. OF
STRAIGHT DUCT
STRAIGHT DUCT
3. The system will operate most efficiently when the ductwork
does not exceed 40 feet of equivalent duct. The chart, above,
shows equivalent feet of elbows and transitions. The number
of feet of straight duct plus the equivalent feet of transitions
and/or elbows to be used should equal 40 feet or less.
NOTE: The equivalent feet of various roof and wall caps has
been taken into consideration. Do not include them in this
calculation.
(CONTINUED)
LEFT
DISCHARGE
RIGHT
DISCHARGE
DOWN DISCHARGE
3-1/4" X 10"
O
90
ELBOW
EQUALS 14 FT. OF
STRAIGHT DUCT
Exterior Blower Installation
SIDE VIEW
OF DOWNDRAFT
Exterior Blower Installation
1. The interior
downdraft blower
system is designed
for use with 3-1/4" x
14" ductwork (can be
transitioned to 8"
round). Three
different discharge
directions are
available with side-to-
side adjustment for
accurate alignment of
ductwork.
2. For best performance:
Choose the ducting
option which allows
the shortest length of
ductwork and a
minimum number of
elbows and transitions. Check location of floor joists, wall
studs, electrical wiring or plumbing for possible interfer-
ence.
3-1/4" X 14" TO 8" RD.
8" ROUND ELBOW
TRANSITION
EQUALS
5 FT. OF
EQUALS 11 FT. OF
STRAIGHT
STRAIGHT DUCT
DUCT
3. The system will operate most efficiently when the ductwork
does not exceed 40 feet of equivalent duct. The chart, above,
shows equivalent feet of elbows and transitions. The number
of feet of straight duct plus the equivalent feet of transitions
and/or elbows to be used should equal 40 feet or less.
NOTE: The equivalent feet of various roof and wall caps has
been taken into consideration. Do not include them in this
calculation.
Downdraft Ventilators
LEFT
DISCHARGE
DISCHARGE
DOWN DISCHARGE
3-1/4" X 14" 90
ELBOW
EQUALS 19 FT. OF
STRAIGHT DUCT
Page 3
RIGHT
O
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