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.

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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

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