Ran Chen, EA, CFP®
Trades Exam Prep
Trades Exam Prep is a free, daily podcast by OpenExamPrep covering the most in-demand skilled trades licensing and certification exams — including EPA 608 (HVAC refrigerant), FAA Part 107 (drone), Master Electrician, Plumber, General Contractor, ASE automotive, NATE, OSHA 10/30, Welder Certification, and more. Each 5-minute episode breaks down one exam topic with concrete examples, common exam traps, code references, and field-ready memory tricks to help you pass on your first attempt. No fluff, no filler — just the concepts you need to know, explained the way the exam tests them. This podcast...
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Autore
Ran Chen, EA, CFP®
Categoria
Sito del podcast
Ultimo episodio
8 nov 2026
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Episodi
NATE HVAC Exam Prep 7, Superheat and Subcooling Fundamentals 25.08.2026 3:46
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate evaporator superheat, total superheat, and co...
NATE HVAC Exam Prep 6, Pressure Temperature Relationships and Saturation 24.08.2026 4:22
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How saturation temperature, boiling, and condensing function a...
NATE HVAC Exam Prep 5, The Refrigeration Cycle and Component Roles 23.08.2026 3:10
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Tracing refrigerant temperature, pressure, and phase changes t...
NATE HVAC Exam Prep 4, Heat Transfer BTUs and System Capacity 22.08.2026 3:55
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Differentiation between conduction, convection, and radiation...
NATE HVAC Exam Prep 3, HVAC Tools and Measurement Accuracy 21.08.2026 2:58
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - CAT rating requirements and meter safety protocols for NATE ce...
NATE HVAC Exam Prep 2, Jobsite Safety PPE and Hazard Control 20.08.2026 3:44
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How OSHA 1910.147 lockout and tagout procedures require testin...
NATE HVAC Exam Prep 1, Understanding the CHP-5 Certification Path 19.08.2026 3:37
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Five separate 30-question modules that make up the NATE CHP-5...
EPA 608 Prep 40, Exam Day Strategy — Common Traps and High-Yield Topics 18.08.2026 4:06
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Key recovery efficiency numbers (90% active vs. 80% passive) a...
EPA 608 Prep 39, Oil Recovery and Acid Tests — Compressor Health 17.08.2026 3:20
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Understand that recovered refrigerant oil is regulated waste a...
EPA 608 Prep 38, Brazing and System Opening — Recover First, Always 16.08.2026 3:33
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Always recover refrigerant to 0 psig before applying heat or o...
EPA 608 Prep 37, Evacuation and Deep Vacuum — Microns and Moisture Removal 15.08.2026 2:45
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - A micron gauge, not a manifold gauge, is required to measure a...
EPA 608 Prep 36, The R-22 Phaseout and the AIM Act HFC Phase-Down 14.08.2026 3:19
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The critical difference between the R-22 phaseout (for ozone,...
EPA 608 Prep 35, Refrigerant Safety — Asphyxiation, Frostbite, and Toxic Decomposition 13.08.2026 2:48
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why refrigerants, being heavier than air, create a significant...
EPA 608 Prep 34, How the EPA 608 Exam Is Structured and Scored 12.08.2026 2:57
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The EPA 608 exam consists of four independent 25-question sect...
EPA 608 Prep 33, Universal Certification — What It Covers and Scoring 11.08.2026 3:42
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - That Universal Certification is earned by passing the Core, Ty...
EPA 608 Prep 32, Charging and Breaking the Vacuum on Low-Pressure Systems 10.08.2026 2:54
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why you must always break the vacuum on a low-pressure chiller...
EPA 608 Prep 31, Recovery of Low-Pressure Refrigerants — Recovery Units and Order 09.08.2026 3:04
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why a dedicated recovery unit with a 10 psig high-pressure cut...
EPA 608 Prep 30, The Purge Unit — Removing Non-Condensables from Chillers 08.08.2026 3:12
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - That purge units are required on low-pressure chillers because...
EPA 608 Prep 29, Operating in a Vacuum — How Low-Pressure Systems Pull in Air 07.08.2026 2:48
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why leaks in low-pressure chillers draw air and moisture INTO...
EPA 608 Prep 28, Type III — Low-Pressure Refrigerants and Centrifugal Chillers 06.08.2026 3:15
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to identify Type III appliances and their associated low-p...
EPA 608 Prep 27, Recovery of High-Pressure Refrigerants — Methods and Targets 05.08.2026 3:18
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - To use the push-pull method for rapid liquid recovery from lar...
EPA 608 Prep 26, POE Oil and the Moisture Problem in R-410A Systems 04.08.2026 3:28
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why R-410A systems mandate the use of synthetic POE (polyolest...
EPA 608 Prep 25, Why R-410A Cannot Replace R-22 in Older Systems 03.08.2026 3:07
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why R-410A's operating pressure is 50-70% higher and poses a r...
EPA 608 Prep 24, Very High-Pressure Refrigerants — R-744 and Subcritical CO2 02.08.2026 3:18
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - R-744 (CO2) is the primary very-high-pressure refrigerant on t...
EPA 608 Prep 23, Type II — High-Pressure Refrigerants (R-22, R-410A, R-407C) 01.08.2026 2:49
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - That Type II certification covers high-pressure (R-22, R-410A)...
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