Free Exam Prep Guide
No fluff. No textbook filler. Just the 10 concepts that separate candidates who pass from those who retake — written by a senior auditor with 30+ years in the field.
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What's Inside
01 / 10
Why the mental shift from product thinking to flow-pressure-power thinking is what the exam actually rewards.
02 / 10
Every 2 psi costs ~1% of compressor energy. Know the formula, know the filter math, walk into the exam confident.
03 / 10
Two concepts candidates confuse constantly. The exam tests both — and so does a real audit.
04 / 10
The universal efficiency metric used on CAGI data sheets and throughout the exam. Know how to read it and calculate it.
05 / 10
Particulate, moisture, oil — three categories, six classes, one table you need to know cold.
06 / 10
One of the most consistently tested quantitative skills. Includes the correction factor distractor examiners love to use.
07 / 10
Receivers aren't passive. They buffer demand events and protect controls — and the exam tests both purposes and sizing.
08 / 10
Load/unload vs. modulation vs. VFD — how part-load power really behaves, and when each strategy wins.
09 / 10
The official CCASS exclusions list. Knowing what's out of scope protects your study time and prevents wrong-answer traps.
10 / 10
The three-zone model that separates candidates who pass from those who retake. The most important shift in the guide.
Ron Marshall is a senior compressed air auditor, CAC Course Author, and holder of both the CCASS and CCASA certifications. He has audited systems across North America and built the curriculum that trains the next generation of compressed air professionals.
This guide isn't a textbook summary. It's the 10 places where field experience and exam thinking diverge — and how to bridge that gap before exam day.
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