Broan Elite RMDD3004 Mode D'emploi page 3

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TAKE MEASUREMENTS
Internal Blower Installation
SIDE VIEW
OF DOWNDRAFT
PLAN THE DUCTWORK
Internal Blower Installation
1. The interior down-
draft blower system is
designed for use with
3-1/4" x 10" ductwork
(can be transitioned
to 6" round). Three
different discharge
directions are avail-
able 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 transi-
tions. Check location of floor joists, wall studs, electrical
wiring or plumbing for possible interference.
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
External Blower Installation
SIDE VIEW
OF DOWNDRAFT
External Blower Installation
1. The exterior down-
draft blower system is
designed for use with
3-1/4" x 14"rectan-
gular ductwork (can
be transitioned to 8"
or 10" round). Three
different discharge
directions are avail-
able 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 interference.
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
RIGHT
DISCHARGE
DOWN DISCHARGE
3-1/4" X 14" 90
ELBOW
EQUALS 19 FT. OF
STRAIGHT DUCT
Page 3
O

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