Rangemaster RMDD3004 Instruction Manual - Downdraft Ventilators

Downdraft Ventilators

Page 3

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

RIGHT

DISCHARGE

DOWN DISCHARGE

LEFT

DISCHARGE

PLAN THE DUCTWORK

Interior Blower Installation

Exterior Blower Installation

EQUALS 8 FT. OF

STRAIGHT DUCT

6" ROUND

ELBOW

EQUALS 14 FT. OF

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.

3-1/4" X 10" TO 6" RD.

TRANSITION

3-1/4" X 10"

90

O

 ELBOW

elbows and transitions. Check location of floor joists, wall

studs, electrical wiring or plumbing for possible interfer-

ence.

EQUALS

2 FT. OF

STRAIGHT DUCT

1. The exterior

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 perfor-

mance: Choose the

ducting option which

allows the shortest

length of ductwork

and a minimum

RIGHT

DISCHARGE

DOWN DISCHARGE

LEFT

DISCHARGE

EQUALS 11 FT. OF

STRAIGHT DUCT

8" ROUND ELBOW

EQUALS 19 FT. OF

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.

3-1/4" X 14" TO 8" RD.

TRANSITION

3-1/4" X 14" 90

O

ELBOW

number of elbows and transitions. Check location of floor

joists, wall studs, electrical wiring or plumbing for possible

interference.

EQUALS

5 FT. OF

STRAIGHT

DUCT

Interior Blower Installation

Exterior Blower Installation

TAKE MEASUREMENTS 

(CONTINUED)

SIDE VIEW

OF DOWNDRAFT

SIDE VIEW

OF DOWNDRAFT