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DUCT PIECE DESCRIPTION MULTIPLIER QTY USED
1’ of 6” Round Duct
1’ of 3 1/4“ x 10” Rect. Duct
6” 90 Degree Elbow
6” 45 Degree Elbow
3 1/4” x 10” 90 Degree
3 1/4” x 10” 45 Degree
3 1/4” x 10” Side 90 Degree
3 1/4” x 10” x 6” Round
3 1/4” x 10” x 6” 90 Degree
6” Round Wall Cap w Damper
3 1/4” x 10” Wall Cap w Damper
6” Round Roof Cap
1
1
12
7
14
8
33
2
4
24
24
33
TOTAL EQUIVALENT FEET SHOULD BE LESS THAN 100
CAUSING AIR TO CHANGE DIRECTION CAUSES TURBULENCE AND RESTRICTS FLOW IN A SYSTEM.
IF USING FLEXIBLE METAL DUCT - INCREASE ALL MULTIPLIERS BY 50% (12 BECOMES 18 - ETC.)
THIS EASY TO USE WORKSHEET IS FOR 600 CFM OR LESS.
UNDER “QTY USED” ENTER HOW OF EACH SECTION YOU WILL BE USING.
IN THE FIRST TWO ROWS - ENTER HOW MANY FEET OF EACH TYPE OF STRAIGHT DUCT YOU WILL
BE USING (I.E. FOR 20 FT ENTER 20, FOR 30’ ENTER 30).
ENTER THE NUMBER OF EACH TYPE OF TURN YOU ARE USING AND THE TYPE OF END CAP.
MULTIPLY ACROSS EACH ROW THE “MULTIPLIER” x “QTY USED” TO GET THE EQUIVALENT FEET
FOR THOSE COMPONENTS.
ADD UP ALL THE VALUES IN THE “EQUIVALENT FEET” COLUMN.
estimating total equivalent feet in a duct
EQUIVALENT
FEET
9
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