Ducting Calculations

Using the table row of the booth width required, multiply the quantity of ducting components needed by the values from the Pressure Losses table.

Booths with 1 fan will require:
1 x sqr – rnd
1 x duct exit
1 x filter
+ duct run per fan

Booths with 2 fans will require:
2 x sqr – rnd
2 x duct exit
1 x filter
+ duct run per fan

Example 1
1m wide booth with:
1 x sqr – rnd @ 14Pa
2 x 3m straight duct @ 24Pa
2 x 45° duct bend @ 8Pa
1 x duct exit @ 24Pa
1 x filter @ 35Pa
Total pressure loss = 14 + 24 + 8 + 24 + 35 = 105Pa

Example 2
5m wide booth with:
2 x sqr – rnd @ 28Pa
4 x 3m straight duct @ 24Pa
4 x 30° duct bend @ 33Pa
2 x duct exit @ 186Pa
1 x filter @ 35Pa
Total pressure loss = 28 + 28 + 33 + 186 + 35 = 310Pa
310 Pa /2 fans = 155 Pa per fan

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Booth Information / Pressure Losses (Pa)

Booth Width (m) Duct Size No. of Fans Speed Through Duct (m/s) Volumetric Flow Rate (m3/s) Sqr-Rnd Straight Duct (3m) Duct Bend 30° Duct Bend 45° Duct Bend 90° Exit Filter
1 450 1 9.90 1.58 9 6.54 7 10 20 24 85
2 630 1 10.11 3.15 9 4.86 7 10 20 61 85
3 710 1 11.93 4.73 13 6 10 15 30 86 85
4 900 1 9.90 6.30 9 3.3 7 10.5 21 59 85
5 710 2 9.95 3.94 9 4.2 7 10.5 21 60 85
6 710 2 11.93 4.73 13 6 10 15 30 86 85

Maximum pressure calculations for Centrifugal Fan power ratings

Booth Width (m) Designed Motor Rating (Kw) Max Pressure for Motor Rating (Pa) Per Fans
1 0.75 155
2 2.2 255
3 3 220
4 7.5 400
5 2.2 235
6 3 225

If the pressure loss calculated exceeded the given maximums, please contact us with all appropriate details so a new motor rating can be calculated.

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