Daily Code Talk is a free educational series published by Osmany Portal, PE - principal engineer at Masterbuild Consulting in Miami, FL. Each post breaks down one section of the International Mechanical Code (IMC) 2024 in plain English: what it requires, why it generates redlines at plan review, and what to put on the drawings to clear first review.
Who this series is for
Owners, architects, GCs, PMs, project engineers, and anyone who touches a mechanical permit - whether you're submitting drawings, reviewing them, or managing a project where plan review delays are costing you money. You don't need an engineering degree to get value from this series. You need to understand what the AHJ is looking for and what your drawings need to show.
What we cover
Every chapter of the IMC 2024 - Chapter 1 (Administration) through Chapter 6 (Duct Systems) and beyond. We go section by section: the plain-English rule, the most common redline patterns, the drawing check, and when to escalate to a PE. Chapter 1 - Administration: Permits, inspections, compliance, appeals Chapter 2 - Definitions: The terms that control every requirement Chapter 3 - General Regulations: Location, clearances, access, condensate Chapter 4 - Ventilation: Outdoor air rates, natural vs.
mechanical ventilation, controls Chapter 5 - Exhaust Systems: Required exhaust, dryer ducts, kitchen hoods, hazardous exhaust Chapter 6 - Duct Systems: Materials, construction, plenums, dampers Chapters 7-8 and beyond: combustion air, chimneys and vents, and the specialty systems that follow.
mechanical, parking garages Chapter 5 - Exhaust Systems: Kitchen hoods, hazardous exhaust, smoke control Chapter 6 - Duct Systems: Duct construction, plenums, insulation, dampers
How to use this series
Read the posts in chapter order for a full IMC education. Or search by section number when a specific requirement is relevant to your current project. Every post ends with a QA Lens - the one thing plan reviewers are most likely to check - and a Drawing Check you can run before you submit.
Masterbuild Consulting
Masterbuild is a boutique MEP engineering firm in Miami, FL. We provide PE-stamped plan review, pre-submittal coordination, and field support for owners, developers, GCs, and architects across Florida and multi-state. If a Daily Code Talk post raises a question about your specific project, that's where we come in.
Code Path: IMC Table of Contents: Chapter 1 (Administration) -> Chapter 2 (Definitions) -> Chapter 3 (General Regulations) -> Chapter 4 (Ventilation) -> Chapter 5 (Exhaust) -> Chapter 6 (Ducts). Each chapter builds on the prior.
Chapter 1 controls permits and approvals. Chapter 3 controls installations. Chapters 4-6 govern specific systems.
Each IMC chapter is a standalone compliance layer - skipping to a technical section without checking Chapter 1 scope and Chapter 2 definitions is the most common setup error.
Confirm local amendments and referenced code adoptions before citing any specific IMC section.
Check: Before You Submit
Confirm the applicable IMC edition and jurisdiction adoption are cited on M-001 before referencing any specific section.
Verify the project scope (new, alteration, replacement) determines which chapters apply and to what extent.
Confirm the code path is established before specifying systems or layouts so the correct technical chapter governs.
Review Risk:
Scoping to the wrong code or wrong edition is the single most expensive pre-submittal mistake - all downstream decisions may be wrong.
Referencing IMC sections without confirming local amendments generates AHJ questions during plan review.
Mixing requirements from different code editions without a clear hierarchy note on the cover sheet.
Masterbuild QA Lens
The Daily Code Talk series is a drawing review tool, not a substitute for engineering judgment. Each post flags where code logic affects a drawing decision - PE verification is still required for project-specific conditions, AHJ variations, and design assumptions.
Drawing / Submittal Check
The Daily Code Talk series is organized by IMC chapter and section. Use the chapter structure as a drawing coordination checklist - each chapter maps to a system type, and the drawing set should show compliance with each applicable chapter.
Common Review Risk
The most common entry-point mistake is scoping the wrong code. Before the first drawing is produced, confirm whether the project falls under the IMC, IFGC, IBC Chapter 28, ASHRAE 170, or some combination - the answer changes which standards govern each system.
When To Escalate
Escalate when the project scope includes occupancy types, systems, or code interactions not covered by a standard IMC application - healthcare, hazardous occupancies, smoke control, and mixed-use projects regularly require PE judgment before drawing coordination begins.
Kitchen Exhaust Coordination
For kitchen exhaust, tie the hood schedule, appliance lineup, grease duct route, cleanouts, fan discharge, fire suppression interface, and make-up air strategy into one reviewable story.
Special Exhaust Coordination
For specialty exhaust, start with the contaminant and source. Then confirm capture method, duct material, routing, discharge, separation, controls, and whether another consultant or AHJ review is required.