Static Pressure Calculator

Static Pressure Calculator L = CENTER DISTANCE INCHES DUCT DIA

34 18

VELOCITY

1500

Q = Air Flow Rate, CFM D = DUCT DIA IN FEET A = AREA, Feet Squared V = AIR VELOCITY, Feet Per Minute VP = VELOCITY PRESSURE L = CENTER LINE DISTANCE, Feet C = DYNAMIC LOSS COEFFICIENT

2650.73 1.5 1.77 1500 0.14 2.83 1.25

DUCT STATIC PRESURE = FRICTION LOSS + DYNAMIC LOS SPF = FRICTION LOSS SPD = DYNAMIC LOSS

0.01 0.18

SP = STATIC PRESSURE

0.18

ient duct get Total SP for system

1. 2. 3. 4. 5. 6.

Enter number for L in inches Enter Duct Diameter Enter Velocity Enter C - dynamic loss coeffic Then get SP for each piece of Do this for each duct piece to

ient duct get Total SP for system

PART Factory Installed Riser Field Installed Riser Straight Duct Adjustable Duct Adaptor (all sizes) 90 Elbow (8" diameter) 90 Elbow (10" diameter) 90 Elbow (12" diameter) 90 Elbow (14" diameter) 90 Elbow (16" diameter) 90 Elbow (18" diameter) 90 Elbow (20" diameter) 90 Elbow (24" diameter) 45 Elbow (8" diameter) 45 Elbow (10" diameter) 45 Elbow (12" diameter)

PART Factory Installed Riser Field Installed Riser Straight Duct Adjustable Duct Adaptor (all sizes) 90 Elbow (8" diameter) 90 Elbow (10" diameter) 90 Elbow (12" diameter) 90 Elbow (14" diameter) 90 Elbow (16" diameter) 90 Elbow (18" diameter) 90 Elbow (20" diameter) 90 Elbow (24" diameter) 45 Elbow (8" diameter) 45 Elbow (10" diameter) 45 Elbow (12" diameter) 45 Elbow (14" diameter) 45 Elbow (16" diameter) 45 Elbow (18" diameter) 45 Elbow (20" diameter) 45 Elbow (24" diameter) Duct Tee (8" diameter) Duct Tee (10" diameter) Duct Tee (12" diameter) Duct Tee (14" diameter) Duct Tee (16" diameter) Duct Tee (18" diameter) Duct Tee (20" diameter) Duct Tee (24" diameter) Y Tee (12" diameter) Y Tee (14" diameter) Y Tee (18" diameter) Y Tee (20" diameter) Y Tee (24" diameter) Off Set Collar

L Center Distance in Inches 4 4 Depends on Length Depends on Length minus Minimum Overlap 13 15 16 17.5 18.7 21 22 23.5 26.5 8.8 9.5 10.2 10.9 11.6 12.3 13 14.4 15 17 19 21 23 25 27 31 28 30 33.5 35.5 54 4 when matched with horizontal run

8" Duct Diameter Duct Component

Dynamic Loss Coefficient

RISER/FRISER STRAIGHT/ADJ ADAPTOR (8 TO 12) 90 ELBOW 45 ELBOW DUCT TEE

0.017 See Design Guide 0.797 0.400 0.150 1.250



RISER/FRISER STRAIGHT/ADJ ADAPTOR (10 TO 14) 90 ELBOW 45 ELBOW DUCT TEE

0.013 See Design Guide 0.470 0.420 0.150 1.250



RISER/FRISER STRAIGHT/ADJ ADAPTOR (12 TO 18) 90 ELBOW 45 ELBOW DUCT TEE Y TEE

0.011 See Design Guide 0.797 0.440 0.150 1.250 0.600



RISER/FRISER STRAIGHT/ADJ ADAPTOR (14 TO 20) 90 ELBOW 45 ELBOW DUCT TEE Y TEE

0.010 See Design Guide 0.522 0.460 0.150 1.250 0.600



RISER/FRISER

0.008

STRAIGHT/ADJ ADAPTOR (16 TO 24) 90 ELBOW 45 ELBOW DUCT TEE

See Design Guide 0.797 0.480 0.150 1.250



RISER/FRISER STRAIGHT/ADJ 90 ELBOW 45 ELBOW DUCT TEE Y TEE

0.006 See Design Guide 0.500 0.150 1.250 0.600




0.005 See Design Guide 0.520 0.150 1.250 0.600




0.004 See Design Guide 0.540 0.150 1.250 0.600

Straight and Adjustable Dynamic Loss

Coefficient Table

Duct Velocity (V) = CFM/Area (in ft sq) = FPM Round Area 8" = 50.24 in sq or 0.348 ft sq 10" = 78.5 in sq or 0.545 ft sq 12" = 113.04 in sq or 0.79 ft sq 14" = 153.86 in sq or 1.07 ft sq 16" = 200.96 in sq or 1.40 ft sq 18" = 254.34 in sq or 1.77 ft sq 20" = 314.00 in sq or 2.18 ft sq 24" = 452.16 in sq or 3.14 ft sq Square Area 12" = 144 in sq or 14" = 196 in sq or 16" = 256 in sq or 18" = 324 in sq or 20" = 400 in sq or 22" = 484 sq in or 24" = 576 sq in or

1.00 1.36 1.78 2.25 2.78 3.36 2.00

ft ft ft ft ft ft ft

sq sq sq sq sq sq sq

Static Pressure Calculator

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