Blow Back Damper

blow back damper

Blow back dampers are used on the inlet of hazardous collectors. They ensure no re-entrainment occurs when the blower is off. It also ensure there is a seal, if a fire occurs, stopping the smoke from returning to the shop via the ductwork.

The Airex Industries line of blow back dampers range from 6’’ to 42’’. Blow back damper is constructed of heavy-duty metal and custom sizes are available.

How it Works

The hinged door swings open under vacuum to let the air and the particles into the dust collector’s inlet. When the blower is turned off, the door of the blow back damper drops down and closes itself via gravity, ensuring that no re-entrainment occurs. The valve of the blow back damper also acts as a seal in case of a fire, preventing the smoke from going back to the shop.

 

Standard Characteristics

  • 12 gauge steel construction
  • Standard sizes from 6'' to 42''
  • Flange bearings
  • Cover type access door
  • Inlet and outlet boltable ring

Options

  • Companion flanges
  • Anti-abrasion hinged plate

Selection Criteria

Dimensions and Specifications

  • Models range from 6” to 42”
  • Depending upon the model, the width, depth and height will vary
  • Weight will also vary depending on the model

Applications

  • All non oxidized dust particles applications

Advantages

  • Added safety, seal, in case of a fire
  • Prevents any re-entrainment when the dust collector is inactive
  • Low capital investment and maintenance costs
  • Ease of inspection even while in operation
  • Helps conforming to NFPA standards

Specifications

blow back damper specifications

Model A B C Weight (lbs)
BL-6 7 19 9 ½ 36
BL-7 8 20 10 ½ 47
BL-8 9 21 11 ½ 53
BL-9 10 22 12 ½ 59
BL-10 11 23 13 ½ 65
BL-11 12 24 14 ½ 72
BL-12 13 25 15 ½ 80
BL-13 14 26 16 ½ 89
BL-14 15 27 17 ½ 99
BL-15 16 28 18 ½ 110
BL-16 17 29 19 ½ 122
BL-17 18 30 20 ½ 135
BL-18 19 31 21 ½ 149
BL-19 20 32 22 ½ 164
BL-20 21 33 23 ½ 178
BL-21 22 34 24 ½ 193
BL-22 23 35 25 ½ 209
BL-23 24 36 26 ½ 226
BL-24 25 37 27 ½ 244
BL-25 26 38 28 ½ 262
BL-26 27 39 29 ½ 282
BL-27 28 40 30 ½ 302
BL-28 29 41 31 ½ 324
BL-29 30 42 32 ½ 348
BL-30 31 43 33 ½ 374
BL-32 33 45 35 ½ 402
BL-34 35 47 37 ½ 432
BL-36 37 49 39 ½ 464
BL-38 39 51 41 ½ 498
BL-40 41 53 43 ½ 536
BL-42 43 55 45 ½ 576

Get in touch

If you have any questions or request, please contact us by phone or by filling the form below.

Toll Free: +1-800-263-2303

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