Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Dust and Fume Collection Systems
…266 unchanged lines
step: 50
setpoints:
+ - 50
- 100
- 150
…25 unchanged lines
step: 100
setpoints:
+ - 3000
- 3500
- 4000
- 4500
- 5000
+ - 5500
default: 4000
```
…52 unchanged lines
step: 1
setpoints:
+ - 4
- 8
- 10
…20 unchanged lines
step: 1
setpoints:
+ - 1
- 5
- 25
- 75
- 200
+ - 500
default: 25
```
# Air-Material Separator {toc}
−## The collector is the heart of the system, and its type is the central selection. The choice among pulse-jet cartridge, pulse-jet baghouse, cyclone, wet scrubber, and electrostatic precipitator is driven by particle size, dust load, moisture, stickiness, temperature, and the combustibility of the stream. The pulse-jet cartridge collector is the 80% case for general industrial and welding fume; baghouses dominate high-volume wood, grain, and chemical dust; cyclones serve as coarse pre-separators ahead of a fabric filter; wet scrubbers quench sticky, hygroscopic, or readily ignitable dusts. {note}
+## The collector is the heart of the system, and its type is the central selection. The choice among pulse-jet cartridge, pulse-jet baghouse, cyclone, wet scrubber, and electrostatic precipitator is driven by particle size, dust load, moisture, stickiness, temperature, and the combustibility of the stream. The pulse-jet cartridge collector is the most common choice for general industrial and welding fume; baghouses dominate high-volume wood, grain, and chemical dust; cyclones serve as coarse pre-separators ahead of a fabric filter; wet scrubbers quench sticky, hygroscopic, or readily ignitable dusts. {note}
## The collector type shall be selected for the particle-size distribution, dust load, moisture, temperature, and combustibility of the stream it serves.
…29 unchanged lines
step: 0.5
setpoints:
+ - 3
- 4
- 6
- 8
+ - 10
default: 6
```
…7 unchanged lines
step: 0.5
setpoints:
+ - 1
- 1.5
- 2
- 3
+ - 4
default: 2
```
…52 unchanged lines
step: 5
setpoints:
+ - 80
- 90
- 100
- 110
+ - 120
default: 100
```
…7 unchanged lines
step: 0.5
setpoints:
+ - 1
- 2
- 3
- 4
+ - 6
default: 3
```
…7 unchanged lines
step: 0.5
setpoints:
+ - 6
- 8
- 10
+ - 12
default: 10
```
…107 unchanged lines
## Recirculated air shall pass through a secondary after-filter of MERV 16 or HEPA before return to occupied space.
−## Recirculation shall not be used for a toxic dust prohibited from recirculation by OSHA 29 CFR 1910.94 without written AHJ approval.
−
−## The design capture efficiency shall maintain employee exposures at or below 50% of the applicable OSHA PEL as an engineering-control margin.
−
−## The exposure benchmarks that drive the design — total nuisance particulate 15 mg/m³ TWA and respirable 5 mg/m³, respirable crystalline silica 50 µg/m³ TWA, and general welding fume 5 mg/m³ TWA — are PEL ceilings, not targets; the system is sized to hold the breathing zone well below them. {note}
−
```datasheet
label: Secondary after-filter (recirculation only)
…6 unchanged lines
```
+## Recirculation shall not be used for a toxic dust prohibited from recirculation by OSHA 29 CFR 1910.94 without written AHJ approval.
+
+## The design capture efficiency shall maintain employee exposures at or below 50% of the applicable OSHA PEL as an engineering-control margin.
+
```datasheet
label: Governing exposure limit for capture design
…9 unchanged lines
```
+## The exposure benchmarks that drive the design — total nuisance particulate 15 mg/m³ TWA and respirable 5 mg/m³, respirable crystalline silica 50 µg/m³ TWA, and general welding fume 5 mg/m³ TWA — are PEL ceilings, not targets; the system is sized to hold the breathing zone well below them. {note}
+
# Testing {toc}
…101 unchanged lines
- Spare access-door and hopper gaskets
```