Dust Collection Emissions Calculator
Why would I need to calculate the emissions for my dust collector?
Calculating your dust collector emissions is an important step in maintaining air quality compliance and meeting EPA and state permitting requirements. By estimating your emissions, you can determine whether your facility needs an air permit, document compliance for industrial dust control, and ensure your filtration system is performing efficiently. Regular emissions calculations also help identify opportunities to reduce particulate matter, improve energy efficiency, and support a cleaner, safer workplace.
How to Estimate Your Inputs
Airflow (CFM – Cubic Feet per Minute)
Airflow is the volume of air moving through your dust collector. It should be listed on the serial tag or data sheet for your dust collector or fan. If it is not listed, you can also use these estimations, but it is best to know exact CFM to proper emissions calculations.
- Small cartridge collector: 1,000 – 3,000 CFM
- Medium shop system: 3,000 – 10,000 CFM
- Large industrial collector: 10,000 – 50,000 CFM
You can also approximate your airflow using duct size and air velocity. Typical air velocity for dust transport is 3,500 – 4,000 ft/min. Use the following formula to estimate:
CFM=Duct Area (ft²)×Air Velocity (ft/min)
Dust Concentration (mg/m³)
Dust concentration describes how much debris is suspended in the air before filtration. It is often listed in your process data or air permit application. You can also use the following averages. If your collector seems clean, and the air is visibly clear, use the low end of the range.
- Woodworking: 1,000 – 3,000 mg/m³
- Metal grinding: 500 – 2,000 mg/m³
- Powder coating: 200 – 1,000 mg/m³
- Woodworking: 1,000 – 3,000 mg/m³
Collection Efficiency
This is the percentage of debris that your dust collector removes from the air moving through it. It should be listed on your dust collectors technical specifications. If you can’t find it, here are some general guidelines based on the type of collector you have:
- Cyclone: 70 – 90%
- Baghouse: 95 – 99.9%
- Cartridge Collector: 99 – 99.9%
- HEPA filters: 99.97%+