CFM Requirement Calculator - Dust Collection Airflow Calculator
Calculate required CFM (cubic feet per minute) for woodworking tools and design effective dust collection systems. Get tool-specific CFM requirements and system recommendations.
Tool Selection
Total length from collector to tool
90-degree elbows in duct run
CFM Requirements
Select a tool and system parameters, then click "Calculate CFM" to see the requirements.
CFM Quick Reference
Table Saw (10")
350 CFM
Planer (13")
400 CFM
Jointer (6")
350 CFM
Band Saw (14")
350 CFM
Router Table
300 CFM
Understanding CFM Requirements
What is CFM?
CFM (Cubic Feet per Minute) measures the volume of air moved by your dust collection system.
- Higher CFM = More air movement
- Tool Requirements vary by size and type
- Adequate CFM ensures effective dust capture
- Insufficient CFM leads to poor collection
Duct Sizing Impact
Duct diameter significantly affects CFM delivery:
- 4" Duct: Good for 300-400 CFM
- 5" Duct: Handles 400-600 CFM
- 6" Duct: Best for 600-800 CFM
- Maintain 3500-4000 FPM air velocity
- Larger ducts reduce static pressure
Static Pressure
Resistance to airflow in your system:
- Each elbow adds ~2.5" of static pressure
- Long duct runs increase resistance
- Smooth transitions reduce pressure loss
- Blast gates help manage airflow
- Collector must overcome total static pressure
System Design Tips
- Size collector for largest tool + 20% margin
- Use shortest duct runs possible
- Minimize elbows and bends
- Use 45° bends instead of 90° when possible
- Install blast gates at each tool
- Use smooth-wall ducting
- Seal all connections properly