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Mechanical Inspector Illustrated: The Residential Mechanical Code in Drawings, So You Know Which Section Applies One Code Topic per Page

Appliance access, combustion air, vent categories, vent connectors, ducts, dryer ducts, condensate drains and gas piping. Every topic gets its own page: the drawing first, then what you need to remember. 68 illustrated pages.

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Every topic, its own pageEach code rule drawn, with the explanation right beside it
68 illustrated pages9 parts, from the exam and the code book to the final walk
Up-to-date sources2021 IRC Chapters 12–24 and the ICC M1 candidate bulletin
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Look Inside the Book

Every page has a big drawing and a box with the numbers, clearances and code sections you need to know:

Installer vs. inspector: same equipment, one rule — cite the code section, not an opinion.
Installer vs. inspector: same equipment, one rule — cite the code section, not an opinion.
M1401.3 and M1601.1: Manual J loads → Manual S equipment → Manual D ducts
M1401.3 and M1601.1: Manual J loads → Manual S equipment → Manual D ducts
G2407.5.1: 50 cu ft per 1,000 Btu/h — 120,000 Btu/h needs 6,000 cu ft
G2407.5.1: 50 cu ft per 1,000 Btu/h — 120,000 Btu/h needs 6,000 cu ft
Category I to IV: negative or positive pressure × condensing or not, drawn as one 2×2 grid.
Category I to IV: negative or positive pressure × condensing or not, drawn as one 2×2 grid.
M1601.1.1: no supply plenums in stud or joist cavities; exterior wall cavities never; gypsum returns 125°F max.
M1601.1.1: no supply plenums in stud or joist cavities; exterior wall cavities never; gypsum returns 125°F max.
Bath 50 cfm intermittent / 20 continuous · Kitchen 100 / 25 · rated at 0.25 in. w.c.
Bath 50 cfm intermittent / 20 continuous · Kitchen 100 / 25 · rated at 0.25 in. w.c.
Condensate drain: 3/4 in minimum, 1/8 in per foot slope, clearable without cutting (IRC M1411.3).
Condensate drain: 3/4 in minimum, 1/8 in per foot slope, clearable without cutting (IRC M1411.3).
Steel, copper, CSST and PE: four gas piping materials, each sized with its own G2413.4 table.
Steel, copper, CSST and PE: four gas piping materials, each sized with its own G2413.4 table.

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These are real pages from the book. The table of contents is the full one: 9 parts and 64 topics.

The Problem Isn't You. It's How It Was Explained to You.

You're standing in a utility room with a furnace and a water heater behind a closed door, 120,000 Btu/h between them, and you have to decide if there's enough combustion air.

You read that section last night. But the code book hands it to you in paragraphs: volumes, ratios, exceptions for tight construction. This morning, the numbers won't line up.

G2407.5.1: 50 cu ft per 1,000 Btu/h — 120,000 Btu/h needs 6,000 cu ft

In the book, that's one page: the room drawn as a box, 50 cubic feet for every 1,000 Btu/h, and the worked example right on the drawing: 120,000 Btu/h needs 6,000 cubic feet.

The same goes for vent categories, connector slope, dryer duct length, condensate drains and gas pipe sizing: each one has its own page.

You see the room, you run the math and you make the call without paging back through the code book.

COMPARE FOR YOURSELF

The Same Topic, Two Ways to Study It

THIS
  • The code book: line after line
  • Load calcs and equipment sizing explained only in words
  • You walk into the exam with doubts
Where combustion air is to be provided from indoor spaces in accordance with the standard method, the minimum required volume shall be not less than 50 cubic feet per 1,000 Btu/h of the aggregate input rating of all appliances installed in the space, except that where the air infiltration rate is known, the known air infiltration rate method shall apply, and where the space is of insufficient volume, adjoining rooms may be included in the calculation only where communicating through permanent openings sized and located as specified, each opening having a minimum free area of 1 square inch per 1,000 Btu/h, but not less than 100 square inches, one commencing within 12 inches of the top and one within 12 inches of the bottom of the enclosure.
FOR THIS
  • Manual J, S and D in one drawing
  • The code sections in a box
  • You see it and you get it
M1401.3 and M1601.1: Manual J loads → Manual S equipment → Manual D ducts
CONTENTS

Take a Look at the 9 Parts and 64 Topics

The exam and the code book, equipment and access, combustion air, venting, ducts and return air, exhaust and dryer ducts, condensate and refrigerant, gas piping, and fireplaces, CO and the final walk: 68 pages, all illustrated

IThe Exam and the Code Book · pp. 5-9
  1. From Installer to Inspector: What Changes
  2. The M1 Exam at a Glance
  3. The IRC Mechanical Map: Chapters 12 to 24
  4. How to Find a Code Section in Under a Minute
  5. Listing, Labeling and Manufacturer's Instructions
IIEquipment, Location and Access · pp. 10-17
  1. Sizing: Manual J, S and D
  2. Working Space in Front of the Appliance
  3. Appliances in Attics: Passageway and Opening
  4. Attic Service Space, Light and Receptacle
  5. Appliances in Crawl Spaces
  6. Garages: 18 Inches and Impact Protection
  7. Rooms Where Fuel-Burning Appliances Can't Go
  8. Platforms, Supports and the Service Receptacle
IIICombustion Air · pp. 18-22
  1. Why Combustion Air: The 50 Cubic Feet Rule
  2. Indoor Combustion Air: Two Openings
  3. Outdoor Air: 1/4,000, 1/2,000 and 1/3,000
  4. Free Area: Louvers and Grilles
  5. Direct-Vent Appliances Skip the Math
IVVenting · pp. 23-33
  1. The Four Vent Categories
  2. Type B Vent: Clearances and Use
  3. Vent Connectors: Rise and Slope
  4. Single-Wall Connectors: Where Not Allowed
  5. Connector Length and Size
  6. Common Venting Two Appliances
  7. The Orphaned Water Heater
  8. Category IV Plastic Venting
  9. B-Vent Roof Termination
  10. Sidewall Terminations: Direct-Vent Clearances
  11. Mechanical-Draft Terminations
VDucts and Return Air · pp. 34-40
  1. Duct Materials and Building Cavities
  2. Sealing Joints: Mastic and UL 181 Tape
  3. Supporting Flexible Duct
  4. Duct Insulation and the Leakage Test
  5. Where Return Air Can't Come From
  6. Ducts in Garages
  7. Filters, Clearances and Underground Ducts
VIExhaust and Dryer Ducts · pp. 41-47
  1. Bathroom and Kitchen Exhaust Rates
  2. Exhaust Goes Outdoors, Not the Attic
  3. Kitchen Hood Ducts and Makeup Air
  4. Dryer Duct Material and Diameter
  5. Dryer Duct Length: 35 Feet Minus Fittings
  6. Transition Duct and Termination
  7. Whole-House Ventilation
VIICondensate and Refrigerant · pp. 48-52
  1. Primary Condensate Drain
  2. Secondary Drain or Auxiliary Pan
  3. Where the Secondary Drain Ends
  4. Condensate Pumps
  5. Refrigerant Lines and Locking Caps
VIIIGas Piping · pp. 53-61
  1. Approved Gas Piping Materials
  2. Sizing Gas Pipe: The Longest Length Method
  3. CSST Bonding
  4. Concealed Piping and Shield Plates
  5. Supporting Gas Pipe
  6. Underground Gas Pipe
  7. Shutoff Valve and Sediment Trap
  8. Appliance Connectors
  9. The Pressure Test
IXFireplaces, CO and the Final Walk · pp. 62-68
  1. Masonry Chimney: 3-2-10
  2. Factory-Built Fireplaces and Gas Logs
  3. Carbon Monoxide Alarms
  4. Rough-In Inspection Order
  5. Final Inspection Order
  6. Write-Ups That Come Up Most Often
  7. How to Write a Correction Notice

One Page, One Topic, All Clear

Think of it this way:

It's a final inspection. The dryer duct runs from the laundry closet up through the ceiling to an outside wall, with a few elbows along the way, and you have to say whether that length works.

In the book, you open the dryer duct length page and see the whole run drawn end to end: 35 feet maximum, with what each elbow takes off marked on the drawing, and the code section to check against your edition.

M1601.1.1: no supply plenums in stud or joist cavities; exterior wall cavities never; gypsum returns 125°F max.

The same with combustion air, vent connectors, condensate drains, gas pipe sizing and CO alarms: each one on its own page.

Mechanical Inspector Illustrated is 9 parts and 64 topics, all drawn, ending with the rough-in and final inspection order and how to write a correction notice.

What you see drawn, you don't have to memorize.

What's Inside Mechanical Inspector Illustrated:

Ipp. 5-9

The Exam and the Code Book

What changes from installer to inspector, the M1 exam at a glance, the map of IRC Chapters 12 to 24, finding a section fast, listing and manufacturer's instructions.

IIpp. 10-17

Equipment, Location and Access

Manual J, S and D, working space, attic passageways and service space, crawl spaces, garages, rooms where fuel-burning appliances can't go, platforms and supports.

IIIpp. 18-22

Combustion Air

The 50 cubic feet rule, indoor air with two openings, outdoor air ratios, free area of louvers and grilles, and why direct-vent appliances skip the math. You check a furnace closet in one calculation, without rereading the section.

IVpp. 23-33

Venting

The four vent categories, Type B clearances, connector rise and slope, single-wall limits, common venting, the orphaned water heater, plastic venting and every termination. You tell a vent's category from the appliance and know which rules follow.

Vpp. 34-40

Ducts and Return Air

Duct materials and building cavities, mastic and UL 181 tape, flex duct support, insulation and leakage testing, return air limits, ducts in garages, filters and underground ducts.

VIpp. 41-47

Exhaust and Dryer Ducts

Bath and kitchen exhaust rates, exhaust to the outdoors, hood ducts and makeup air, dryer duct material, length and termination, and whole-house ventilation.

VIIpp. 48-52

Condensate and Refrigerant

Primary condensate drain, secondary drain or auxiliary pan, where it ends, condensate pumps, refrigerant lines and locking caps.

VIIIpp. 53-61

Gas Piping

Approved materials, the longest length sizing method, CSST bonding, shield plates, supports, underground pipe, shutoff and sediment trap, appliance connectors and the pressure test. You size a gas run step by step without getting lost in the tables.

IXpp. 62-68

Fireplaces, CO and the Final Walk

Masonry chimneys and 3-2-10, factory-built fireplaces and gas logs, CO alarms, rough-in and final inspection order, the most frequent write-ups and the correction notice.

At the end of the book: Rough-in and final inspection order, plus how to write a correction notice.

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Mechanical Inspector Practice Questions: Exam-Style Questions with Explained Answers

BONUS 1: «Mechanical Inspector Practice Questions: Exam-Style Questions with Explained Answers»

Value on its own: US$ 17.90

Practice with questions written in exam style, each answer explained with the drawing and the code section to look up, so you find out what you still mix up before test day.

The 15 Most Common Mechanical Violations, Before & After

BONUS 2: «The 15 Most Common Mechanical Violations, Before & After»

Value on its own: US$ 14.90

See the 15 most common write-ups in residential mechanical work drawn wrong and then right, so you spot them in seconds on the job and on the exam.

Mechanical Inspector Illustrated with 2 Free Books

  • Mechanical Inspector Illustrated: 68 illustrated pagesUS$ 63
  • BONUS 1: Mechanical Inspector Practice Questions: Exam-Style Questions with Explained AnswersUS$ 17.90
  • BONUS 2: The 15 Most Common Mechanical Violations, Before & AfterUS$ 14.90
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Who This Book Is For

You're studying for the M1 exam

You're studying for the M1 exam

You've done the work for years. Here each code topic is drawn the way you already see it on the job, so you learn the code's language without wading through paragraphs.

Your exam date is set

Your exam date is set

Go through it in the order you inspect a house, check each value against your edition, and know which section to open when a question comes up.

You're already inspecting

You're already inspecting

Keep it printed in the truck: clearances, vent rules, condensate and gas piping on one page each, to check in seconds before you write something up.

Everything You Get Today

US$ 95.80US$ 27
YES, I WANT MECHANICAL INSPECTOR ILLUSTRATED FOR US$ 27

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Frequently Asked Questions

Is it for me if I've been an HVAC tech for years and I'm going for the inspector certification?

Yes. It isn't a beginner's book: it takes the work you already know and shows it in the code's terms, topic by topic. It also works for building or combination inspectors adding the mechanical certification.

Where does the content come from?

From the 2021 International Residential Code, Chapters 12–24 (Mechanical and Fuel Gas), and the ICC candidate bulletin for the Residential Mechanical Inspector (M1) exam. If your exam or your jurisdiction uses the 2018 or 2024 edition, the topics are largely the same, but some values and section numbers can change. That's why every page cites its section: you check it against your edition and your local amendments in seconds.

Is this official material?

No. It's independent study material. It isn't published, endorsed or approved by the ICC or any building department, and it doesn't give you a certificate or continuing education credits: the certification comes only from passing the ICC exam.

The M1 exam is open book. Why do I need another book?

Because open book doesn't mean time to read. The code book is your reference in the exam, but if you have to hunt through paragraphs on every question, the clock runs out. This book helps you understand each topic beforehand and know which section to open. It doesn't replace the code book adopted by your jurisdiction, a course or your field experience.

Are the practice questions the actual exam questions?

No. They're written for this book in exam style, with explained answers. They aren't official questions from any exam.

When and how do I get it?

The book and the 2 bonus books come as PDFs by email, to the address you enter at checkout.

Do I have to pay every month?

No. It's a one-time payment.

Can I get it on paper?

It's a PDF you can print at home or at a print shop, and keep in the truck.

How does the refund work?

You have 30 days. We refund everything if the file won't open, if the book isn't what you see on this page, if you were charged twice or if the email doesn't arrive: just email us.

Before You Close This Page

No more rereading sections that don't stick.

Combustion air, venting and gas piping: you see them drawn and you've got it.

You walk into the exam and onto the job knowing where everything is.

Drawings make studying faster.

The book is right below.

One-time payment: US$ 27 · Guarantee: 30 days · PDF by email

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📄 This is a digital PDF book sent to your email: nothing is printed or shipped.