What does CFM mean on a vacuum pump?

CFM stands for Cubic Feet per Minute. It measures how much air volume a vacuum pump can move at atmospheric pressure. Higher CFM means faster evacuation.

How many CFM vacuum pump do I need for residential AC?

For most residential air conditioning systems (1-5 tons), a 3-7 CFM vacuum pump is sufficient. A 5 CFM pump is the most versatile choice for residential HVAC technicians.

How to calculate vacuum pump CFM?

Use the formula: Required CFM = (System Volume × System Factor) ÷ Evacuation Time × Ln(Atmospheric Pressure ÷ Target Pressure). Apply a 25% safety factor for real-world conditions.

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Vacuum Pump CFM Calculator

Calculate Required CFM for HVAC System Evacuation

1. System Volume (cubic feet) Total internal volume: lines + components + 10% for fittings

2. Target Vacuum Level

3. Desired Evacuation Time (minutes) Industry standard: 30-45 minutes for most systems

4. System Type

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Vacuum Pump CFM Calculator