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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Autor
Ran Chen, EA, CFP®
Categoría
Web del podcast
Último episodio
13 de nov. de 2026
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Episodios
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)...
EPA 608 Prep 22, Small Appliance Refrigerants — R-134a, R-12, and Hydrocarbons 31.07.2026 2:59
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 1995 manufacturing year that distinguishes R-12 (...
EPA 608 Prep 21, Heating Recovery Cylinders and Safe Warm-Up Methods 30.07.2026 4:17
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 heating a recovery cylinder creates a pressure differentia...
EPA 608 Prep 20, Recovery Cylinders and the 80 Percent Fill Rule 29.07.2026 2:31
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: - Recovery cylinders must never be filled beyond 80% of their ca...
EPA 608 Prep 19, Self-Contained Recovery on Small Appliances — the 90% Standard 28.07.2026 3:14
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: - Self-contained recovery machines must be certified to recover...
EPA 608 Prep 18, System-Dependent Recovery on Small Appliances — the 80% Standard 27.07.2026 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: - That system-dependent (passive) recovery is only permissible f...
EPA 608 Prep 17, Type I Open-Book Exam and the Passing Scores 26.07.2026 2:43
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 the EPA 608 Type I exam is the only section that can be a...
EPA 608 Prep 16, Type I — Small Appliances and the 5-Pound Limit 25.07.2026 2:43
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 precise three-part definition of a Type I small appliance:...
EPA 608 Prep 15, Reclaimers and EPA-Authorized Recycling 24.07.2026 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: - Only EPA-certified reclaimers can purify used refrigerant to A...
EPA 608 Prep 14, Refrigerant Sales Restrictions and the Penalty Bounty 23.07.2026 3:09
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 only EPA 608 certified technicians are legally allowed to...
EPA 608 Prep 13, Recordkeeping — What Technicians and Owners Must Document 22.07.2026 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: - The mandatory 3-year record retention period for refrigerant h...
EPA 608 Prep 12, Leak Detection Methods — Bubble, Electronic, Ultraviolet, Nitrogen 21.07.2026 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: - The specific applications and limitations of four primary leak...
EPA 608 Prep 11, Periodic Leak Inspections — When and How Often 20.07.2026 2:39
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 specific leak rate thresholds that trigger mandatory perio...
EPA 608 Prep 10, Leak Repair Requirements and the 50-Pound Threshold 19.07.2026 3:53
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 50-pound charge threshold that triggers mandatory EPA 608...
EPA 608 Prep 9, Recover Before Opening — The 0 psi Rule 18.07.2026 3:41
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: - Before opening any high-pressure refrigerant system for servic...
EPA 608 Prep 8, Refrigerant Recovery Equipment — System-Dependent vs Self-Contained 17.07.2026 3:35
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: - System-dependent (passive) recovery uses the appliance's own c...
EPA 608 Prep 7, Recovery, Recycling, and Reclaim — Three Different Things 16.07.2026 2:26
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 definition of refrigerant recovery as the simple removal a...
EPA 608 Prep 6, The Kigali Amendment and the HFC Phase-Down 15.07.2026 3:24
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 Kigali Amendment targets high-GWP HFC refrigerants for the...
EPA 608 Prep 5, Ozone Depletion Potential (ODP) and Global Warming Potential (GWP) 14.07.2026 3:39
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 Ozone Depletion Potential (ODP) is measured against the ba...
EPA 608 Prep 4, CFC, HCFC, and HFC Refrigerants — What's the Difference 13.07.2026 4:32
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 key chemical difference (the presence of chlorine and hydr...
EPA 608 Prep 3, The Montreal Protocol and the Ozone Layer 12.07.2026 3:40
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 direct link between the 1987 Montreal Protocol and the pha...
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