Sirius SU90186 Planning manual

Ductwork Planning Guide

General Information:

• The ductwork transports air born pollutants, moisture and very importantly heat out of the building.

• In addition to good ductwork planning and installation, it is vitally important that your fat filter is washed on a

regular basis.

• The length of ductwork and the number of elbows should be kept to a minimum in order not to degrade the effi­ciency of your range hood.

• Use duct tape to seal all joints and do not use flexible ducting as this not only creates air turbulence but also pro­vides pockets for moisture and fat residue to condense - this poses a serious fire and health hazard . Flexible
ducting effectively double all of the EL’s below.

• Do not under any circumstances use plastic dryer ducting or 4” vent caps

Worksheet for calculating the Effective Duct Length

Duct Components

6” Round Straight

3- 1/4” x 10”
Straight

6” 90 deg Elbow

6” 45 deg Elbow

3- 1/4” x 10”
90 deg Elbow

3- 1/4” x 10”
45 deg Elbow

3- 1/4” x 10”
90 deg Flat Elbow

6” round to 3- 1/4” x
10” transition

3- 1/4” x 10” to 6”
round transition

6” round to 3- 1/4” x
10” 90 deg transition

3- 1/4” x 10” to 6”
round transition elbow

6” round wall cap
damper

3 1/4”x10” wall
cap damper

Round roof cap

EL* Q* TEL*

1

1

15

9

15

9

20

1

5

5

15

30

30

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Legend:

EL* = Effective Length:

By assigning a penalty value to a particu­lar fitting it is possible to arrive at a very
good approximation of the effective length
of the ducting run.

Q* = Quantity of that component used

TEL* = Total Effective Length

Multiply the EL of each component by the
quantity and total the column - this should
not exceed 100 ft

Your notes:

Round roof vent

Total of all TEL’s

Ductwork Rough Drawing:

With compliments of Sirius Range Hoods Ltd - www.siriushoods.com Tel: [phone]

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