Loading...

PODCAST

Trades Exam Prep

Ran Chen, EA, CFP®

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

education courses

All Episodes

04:06

NATE HVAC Exam Prep 28, Humidity Control and...

Trades Exam Prep ·

2026/09/15

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 oversized cooling equipment leads to short-cycling and elevated indoor relative humidity. - The fundamental rule governing surface condensation based on dew

en

04:10

NATE HVAC Exam Prep 27, Ventilation and Outdoor Air

Trades Exam Prep ·

2026/09/14

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: - How outdoor air ventilation dilutes indoor contaminants according to ASHRAE Standards 62.1 and 62.2. - The distinction between positive and negative building

en

04:03

NATE HVAC Exam Prep 26, Filtration and Indoor Air...

Trades Exam Prep ·

2026/09/13

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 distinction between particulate and gaseous contaminants and why MERV-rated media filters do not remove gases or VOCs. - How higher MERV filters and filter

en

03:48

NATE HVAC Exam Prep 25, Blowers Fans and Performance...

Trades Exam Prep ·

2026/09/12

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: - Differences between forward-curved and backward-inclined fan blades including overloading characteristics - Direct drive vs belt drive speed adjustments and sheave

en

03:43

NATE HVAC Exam Prep 24, Duct Design Leakage and...

Trades Exam Prep ·

2026/09/11

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 ACCA Manual D equivalent length and fitting friction impact total available static pressure and system airflow - The operational effects of supply and return

en

03:45

NATE HVAC Exam Prep 23, Airflow CFM and Static Pressure

Trades Exam Prep ·

2026/09/10

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: - How to measure and calculate total external static pressure by combining supply and return pressure magnitudes. - How to determine airflow CFM using manufacturer

en

02:56

NATE HVAC Exam Prep 22, Sensible Latent and Total...

Trades Exam Prep ·

2026/09/09

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: - How to differentiate sensible capacity from latent capacity and calculate total system capacity - How to calculate the Sensible Heat Ratio using sensible capacity

en

03:55

NATE HVAC Exam Prep 21, Psychrometric Properties of Air

Trades Exam Prep ·

2026/09/08

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 difference between relative humidity and humidity ratio on NATE exam questions - How to locate the saturation curve where dry bulb, wet bulb, and dew point

en

03:55

NATE HVAC Exam Prep 20, Electrical Troubleshooting...

Trades Exam Prep ·

2026/09/07

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: - How to apply the seven-step electrical troubleshooting sequence from visual inspection through final operational testing. - How to systematically test 24V control

en

04:15

NATE HVAC Exam Prep 19, Electrical Meter Testing in...

Trades Exam Prep ·

2026/09/06

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: - How to apply the Live-Dead-Live verification protocol before testing unenergized electrical circuits - How to interpret voltage drop across closed versus open

en

04:18

NATE HVAC Exam Prep 18, Reading Schematics and Wiring...

Trades Exam Prep ·

2026/09/05

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 schematics represent all switches and contacts in their de-energized shelf state on NATE exam diagrams - The operational differences between line voltage loads

en

04:09

NATE HVAC Exam Prep 17, Thermostats and HVAC Control...

Trades Exam Prep ·

2026/09/04

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: - Core 24-volt thermostat terminal assignments for R, C, W, Y, and G in heating and cooling control loops - Crucial differences between O and B reversing valve

en

04:26

NATE HVAC Exam Prep 16, Relays Contactors Sequencers...

Trades Exam Prep ·

2026/09/03

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: - Distinction between relays, contactors, and sequencers in HVAC control applications - How normally open and normally closed contacts behave in schematic diagrams -

en

04:13

NATE HVAC Exam Prep 15, Transformers and Low Voltage...

Trades Exam Prep ·

2026/09/02

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 maximum secondary amperage using transformer VA ratings and turns ratio formulas - The impact of incorrect primary multi-tap wiring on low-voltage

en

04:32

NATE HVAC Exam Prep 14, Motors Capacitors and...

Trades Exam Prep ·

2026/09/01

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 operational differences between shaded-pole, PSC, and ECM motors tested on the NATE exam. - How to calculate resistance across common, run, and start terminals

en

04:42

NATE HVAC Exam Prep 13, Alternating Current...

Trades Exam Prep ·

2026/08/31

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: - How frequency and inductance create counter electromotive force and inductive reactance in HVAC motor windings. - How to apply the ELI the ICE man mnemonic to

en

04:05

NATE HVAC Exam Prep 12, Series and Parallel HVAC...

Trades Exam Prep ·

2026/08/30

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: - Voltage drop rules for closed versus open switches in series control circuits - How current and voltage behave across parallel loads versus series safety devices -

en

03:53

NATE HVAC Exam Prep 11, Voltage Current Resistance...

Trades Exam Prep ·

2026/08/29

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 apply Ohm's Law and Watt's Law to calculate voltage, current, resistance, and power in HVAC circuits. - Why a ten percent drop in voltage results in a

en

03:30

NATE HVAC Exam Prep 10, HVAC Fundamentals...

Trades Exam Prep ·

2026/08/28

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: - How to correctly convert temperature between Fahrenheit, Celsius, and absolute Rankine scales on NATE questions. - The vital difference between PSIG and PSIA and

en

04:14

NATE HVAC Exam Prep 9, Combustion Venting and Carbon...

Trades Exam Prep ·

2026/08/27

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 differences between complete and incomplete combustion and primary versus secondary air requirements. - Unconfined space volume rules per NFPA 54 requiring 50

en

138 results

Similar Podcasts

Les dents et dodo

BFMTV

Daily Facts

Amalia Dupray and Montgomery Jones.

Education Futures

Svenia Busson & Laurent Jolie

Out In The Hall

NHSA

Reading Teachers Lounge

Shannon Betts and Mary Saghafi