Ductwork

FastClip Ductwork is manufactured to the highest standards from high quality, smooth and durable galvanised steel. Using our state-of-the-art CAD (Computer-aided design) systems, CNC (Computer Numerical Control) laser cutting, folding, roll-forming and welding equipment to provide the most accurate and flexible system available.

Manufactured in the UK from high quality, smooth and durable galvanised steel

Airflow volumes and area

To assist with selection of ductwork diameters for your extraction system, the table below provides quick reference to Airflow Volume calculations, in m3 per hour, at velocities from 10 metres to 34 metres per second.

Depending on the machinery being used, and the waste material being generated, there will be a minimum velocity requirement to enable the system to provide adequate extraction.

Manufacturers normally specify the minimum extraction requirement to ensure optimum efficiency from a particular machine. For example, in a joinery shop, with waste dust and chips being extracted from a machine requiring a minimum airflow of 1500m3/h, the table below indicates that a minimum duct diameter of 125mmis required so long as the extraction fan is achieving a minimum velocity of 34m/s.

However, if the fan is only achieving a velocity of 28m/s, the minimum duct diameter requirement will be 140mm to meet the machine's minimum airflow volume requirement.

DIAMETER
Ø mm
VELOCITY
10 12 15 18 20 23 25 28 30 32 34
AREA
m2
80 180 217 271 326 362 398 452 489 525 561 597 0.004
100 283 339 424 509 556 650 707 792 848 905 961 0.008
125 442 530 663 795 884 1016 1105 1237 1326 1414 1502 0.012
140 554 665 831 998 1108 1275 1386 1552 1663 1774 1884 0.015
150 636 763 954 1145 1272 1400 1590 1718 1845 1972 2099 0.018
160 724 869 1086 1303 1448 1665 1810 2027 2172 2317 2461 0.02
180 916 1099 1374 1649 1832 2107 2291 2565 2749 2932 3115 0.025
200 1131 1357 1697 2036 2262 2602 2828 3167 3393 3620 3846 0.031
224 1419 1703 2128 2554 2838 3263 3547 3973 4257 4540 4824 0.039
250 1767 2121 2651 3181 3535 4065 4418 4949 5302 5656 6009 0.049
300 2545 3054 3817 4580 5039 5598 6362 6871 7381 7889 8397 0.064
315 2806 3367 4209 5051 5612 6454 7015 7856 8418 8979 9540 0.078
350 3464 4157 5196 6235 6928 7967 8660 9699 10392 11085 11778 0.096
400 4524 5429 6787 8144 9049 10406 11311 12669 13573 14478 15383 0.126
450 5726 6872 8589 10307 11453 13170 14316 16034 17179 18324 19469 0.159
500 7070 8483 10604 12725 14139 16260 17674 19795 21209 22622 24036 0.196
560 8868 10642 13302 15962 17736 20396 22170 24830 26604 28378 30151 0.246
630 11224 13468 16835 20202 22447 25814 28059 31426 33671 35915 38160 0.312
710 14255 17106 21382 25659 28510 32786 35637 39914 42765 45616 48467 0.396