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Baghouse Filter Area Calculator Engineering & Industrial
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Baghouse Filter Area Calculator

Determine required total filter media area (sq ft), recommended Air-to-Cloth (A/C) ratio, filter bag count, and upward interstitial can velocity (FPM).

Total Filter Media Area Required
5,556 sq ft
516 m² total filtration surface
Total Filter Bags
364 Bags
26 rows × 14 columns
Area Per Bag
15.29 sq ft
5.84" × 10 ft sleeve
Can Velocity (Interstitial): 225 ft/min
Tubesheet Floor Footprint: ~148 sq ft
Re-entrainment Assessment: Safe Upward Velocity (< 250 FPM)
Air-to-cloth ratio and can velocity conform to ACGIH Industrial Ventilation design guides.

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Baghouse Sizing & Air-to-Cloth Ratio Engineering

The Air-to-Cloth (A/C) ratio (also known as the filtration velocity) is the volume of exhaust air entering the dust collector divided by the total active surface area of the fabric filter media. It is expressed in units of (ft³/min) / ft² = ft/min (FPM). Sizing a baghouse with too high of an A/C ratio causes blinding, deep dust embedment, excessive differential pressure drop, and frequent bag failure.

Core Sizing Formulas

  1. Total Filter Area (sq ft):
    Media Area = Total Flow (ACFM) / Air-to-Cloth Ratio (FPM)
  2. Single Cylindrical Bag Surface Area:
    Area_bag = π × (Diameter / 12) × Length
  3. Total Filter Bag Count:
    Total Bags = ceil( Total Media Area / Area_bag )
  4. Can Interstitial Velocity:
    The upward air velocity between the filter bags must be kept below 200 to 250 FPM for light powders to allow dislodged dust cakes to fall into the hopper during pulse cleaning without being re-entrained back onto the bags.

Frequently Asked Questions

What is a typical Air-to-Cloth ratio for a pulse-jet baghouse?

For most dry industrial particulates (wood, grains, cement), pulse-jet baghouses operate at an Air-to-Cloth ratio of 3.5:1 to 5.5:1 ft/min. Difficult sub-micron fumes operate at 2.0:1 to 3.0:1.

What is can velocity in baghouse design?

Can velocity (interstitial velocity) is the upward velocity of dusty air traveling between the filter bags. If it exceeds 200 to 250 FPM, dislodged dust cannot fall into the hopper and re-blinds the filters.

Why do shaker and reverse-air baghouses require much lower A/C ratios?

Shaker and reverse-air collectors clean with gentle mechanical shaking or low-pressure backdraft, requiring much larger cloth areas (A/C ratios of 1.5:1 to 2.5:1) compared to high-energy supersonic compressed air pulse jets.