SIZING DUST COLLECTOR BAGS FOR MAXIMUM EFFICIENCY

Optimized Filter Bags improve vacuum & catch dust down to 1 micron!

SIZING DUST COLLECTOR BAGS

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1. Determine CFM of dust collector.
2. Select best bag size from chart.

Many factors affect the performance of your shop’s dust collection system. They include horsepower of the motor, fan design, duct lengths, branches and bends, collection containers, and air filtration bags. Of all these items, replacing original woven cloth bags with new felt bags is by far the most immediate and cost-effective way to improve system performance as well as workshop air cleanliness. Follow the steps below to find what you need.

Charts below are for high airflow 10 oz. Shaker Felt, singed on one side. If using your fan's maximum CFM rating, read off the maximum chart. Use the lower chart for “under load” CFM calculations. Always select a size with at least 50% to 100% extra capacity to minimize backpressure and help disburse dust-laden air.

Calculations and specifications are approximate. Results may vary under actual working conditions. For commercial applications use heavier 12 oz. and 16 oz. felts and design systems for 10 (or less) CFM per square foot.

  • Dust collector brand & model: _______________________ Size of output fitting :_______ Dia / Circ / Flat Width
  • Rated output: ______CFM (max) ______CFM (under working load) Type of dust: _______________________
  • Is your bottom bag (the collector) felt? NO. All air will exit through top bag(s). YES. It’s part of my system. Add in its size and CFM also, then reduce its value by 50% to account for any losses due to full bag.
  • If same bag used for both filtration and collection, reduce value by 50% to account for loss due to dust in bag.
  • Size restrictions (low ceiling, output-to-floor distance, support hook height, etc.)? _______________________

55 CFM/SQ FT - MAXIMUM AIRFLOW CONDITIONS
LENGTH (FEET)

Dia.
 
(IN.) 2 3 4 5 6 7 8 9 10 11 12
10 318 462 606 750 894 1038 1182 1326 1470 1614 1758
12 389 562 734 907 1080 1253 1426 1598 1771 1944 2117
14 462 664 865 1067 1268 1470 1671 1873 2075 2276 2478
16 538 768 998 1229 1459 1689 1920 2150 2381 2611 2841
18 616 875 1134 1393 1652 1911 2171 2430 2689 2948 3207
20 696 984 1272 1560 1848 2136 2424 2712 3000 3288 3576
24 864 1210 1555 1901 2246 2592 2937 3283 3629 3974 4320
36* 1426 1944 2462 2981 3499 4017 4536 5054 5572 6091 6609
48* 2073 2765 3456 4147 4838 5529 6220 6912 7603 8294 8985


40 CFMISQ FT - HEAVY WORKING CONDITIONS
LENGTH (FEET)

Dia.
 
(IN.) 2 3 4 5 6 7 8 9 10 11 12
10 231 336 441 545 650 755 860 964 1069 1174 1278
12 283 408 534 660 785 911 1037 1162 1288 1414 1539
14 336 483 629 776 922 1069 1216 1362 1509 1655 1802
16 391 559 726 894 1061 1229 1396 1564 1731 1899 2066
18 448 636 825 1013 1202 1390 1579 1767 1956 2144 2333
20 506 716 925 1134 1344 1553 1763 1972 2182 2391 2601
24 628 880 1131 1382 1634 1885 2136 2388 2639 2890 3142
36* 1037 1414 1791 2168 2545 2922 3299 3676 4053 4430 4807
48* 1508 2011 2513 3016 3519 4021 4524 5027 5529 6032 6535

* Call for quotes on larger sized bags

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EXAMPLE:

  XYZ-brand dust collector, with an 20 in. dia output fitting, is rated at 800 CFM maximum and 500 CFM working (under load). Its collector is a 55 gal drum, so all air exits through the top bag. Look for a bag that will handle 1200 to 1600 CFM maximum, or 750 to 1000 CFM working (under load) output. From these charts we find the bag should be 20 in. in diameter by 4 to 5 ft. long.

3 Ways to Determine
Bag Size

DIAMETER

Measure across outside of output

CIRCUMFERENCE

Measure around outside of output

FLAT WIDTH

Fold old bag flat. Measure full width

F Y I
Circumference divided by 3.14 (Pi) equals the Diameter.

Flat Width equals onehalf the Circumference.


Call, fax or e-mail us for a no-obligation evaluation of your equipment's performance and a free quote.