Dust Collector Filter Bag Measuring Guide

Six clear steps to capture accurate dimensions and features for your replacement bags.

Gather Your Tools

  • A tape measure or ruler.
  • A helper if the bag is long (keeps bag taut and square).

Prepare the Bag

  • Ensure the bag is completely empty.
  • Lay the bag out flat and smooth it completely.

Tip: If the bag was in service, let it cool and dry before measuring for accuracy.

Measure the Diameter (Flat Width)

  1. Lay the bag flat and measure across → this is the Flat Width.
  2. To calculate Diameter, use:
    Diameter = (Flat Width × 2) ÷ 3.14159

Or use your known tube sheet hole size directly.

Measure the Length (OAL)

  1. For snap-band bags: measure from the centerline of the snap band at the top to the first stitch on the disc bottom.
  2. Some measure from top edge to first stitch—either is fine, just note which method you used.
  3. Keep the bag taut; avoid diagonal pull.

Identify Other Features

Top

  • Snap band, soft collar, flange, hem, V-groove, Super Seal, rope/O-ring, etc.

Bottom

  • Disc (single/double), flat sewn, open, hem, etc.

Reinforcements & Accessories

  • Ground wire: stainless or copper? with terminal/tab?
  • Wear cuff / patch: location and length.
  • Filter media: polyester, polypropylene, acrylic, PPS (Ryton), aramid (Nomex), P84, PTFE, fiberglass.

Record Your Measurements

Fill this worksheet on-screen. The Diameter is auto-calculated. Print, or email directly to our team.

Entries aren’t stored—print to PDF or send via your email client.