Home / Compressed Air Buying Guide

Compressed Air Buying Guide

Compressed Air Buying Guide

Everything you need to know to choose the right compressed air system for your application.

Step 1: Determine Your Air Demand

Start by calculating your total CFM (Cubic Feet per Minute) requirement. Add up the air consumption of every tool, machine, and process that uses compressed air. Then add 20-30% for leaks, future expansion, and simultaneous use.

Quick Reference — Common CFM Requirements:
Impact Wrench (1/2") 4-5 CFM
Paint Spray Gun (HVLP) 8-12 CFM
Sandblaster 20-50 CFM
CNC Machine 10-25 CFM
Packaging Machine 5-15 CFM

Step 2: Choose Your Compressor Type

Fixed Speed Rotary Screw

Best for: Steady, consistent demand. Most cost-effective upfront. Runs at full speed whenever on.

Variable Speed (VFD)

Best for: Fluctuating demand. Saves 20-35% on energy. Higher upfront cost, fast ROI.

Oil-Free

Best for: Food, pharma, electronics, painting. Zero risk of oil contamination in the air stream.

Reciprocating (Piston)

Best for: Intermittent use, small shops. Lower cost but louder and less efficient at high duty cycles.

Step 3: Size Your Air Dryer

Your dryer must be rated for at least the full output of your compressor. Match the dryer's CFM rating to your compressor's rated output. For high-temperature environments (above 100°F inlet), oversize by 25-50%.

Dryer Types:
  • Refrigerated — Dewpoint: 35-39°F. Handles most general industrial applications.
  • Desiccant — Dewpoint: -40°F to -100°F. Required for critical applications.
  • High-Temperature — For inlet temps above 180°F (no aftercooler).

Step 4: Plan Your Air Distribution

Undersized piping causes pressure drops that waste energy and reduce tool performance. Use aluminum piping for clean, leak-free distribution. Size your main header for future capacity, not just current demand.

Step 5: Don't Forget Air Treatment

A complete system includes filtration (particulate and coalescing filters), condensate management (drains and oil/water separators), and adequate storage (air receiver tanks). Skipping these components leads to moisture damage, oil contamination, and pressure fluctuations.

Need help choosing?

Our specialists will help you size and spec the right system. Call (888) 555-0199 or request a quote.