IMC 607 is where ductwork meets rated construction. This section is not just "add a fire damper." It is about identifying the assembly, selecting the correct damper or exception, showing actuation, and providing access.
We'll cover IMC 607 in 10 parts:
Part 1 (607.1-607.1.2.1): General protection rules
Duct/transfer opening protection, ducts between shafts, penetrations without dampers, and IBC coordination.
Part 2 (607.2-607.2.4.1): Damper installation rules
Manufacturer instructions, listings, smoke control conflicts, hazardous exhaust, static dampers, and MEP controls in ducts.
Part 3 (607.3-607.3.3.5): Testing, ratings, and actuation
UL 555, UL 555S, UL 555C, damper ratings, heat-responsive devices, and smoke detector actuation.
Part 4 (607.4-607.4.2): Access and identification
Access size, removable duct sections, rated assembly integrity, remote inspection, and damper labels.
Part 5 (607.5-607.5.2.1): Fire walls and fire barriers
Fire wall penetrations, horizontal exits, fire barriers, exit enclosures, smoke control exceptions, and fully ducted exceptions.
Part 6 (607.5.3): Fire partitions
Fire partition penetrations, corridor walls, sprinklered exceptions, small-duct exceptions, sleeve/angle details, and ducted HVAC exceptions.
Part 7 (607.5.4-607.5.4.1): Corridors and smoke barriers
Smoke dampers, corridor dampers, ceiling radiation dampers, corridor/smoke barrier exceptions, and actuation.
Part 8 (607.5.5-607.5.7): Shafts, exterior walls, and smoke partitions
Shaft penetrations, subduct exceptions, parking garage shafts, upward airflow, rated exterior walls, and smoke partition openings.
Part 9 (607.6-607.6.3): Horizontal assemblies
Floor/ceiling penetrations, shaft options, through penetrations, membrane penetrations, ceiling radiation dampers, and nonrated floor assemblies.
Part 10 (607.7): Flexible ducts and air connectors
Flexible ducts and air connectors cannot pass through fire-resistance-rated assemblies.
On Plans: Why it matters
Most IMC 607 redlines come from guessing. The plans show a duct crossing a wall, floor, shaft, corridor, or smoke barrier, but the set does not identify the rating, damper type, exception, access, or actuation method.
Code Path: Where to show it
M-001: IMC 607 notes, damper criteria, exceptions, access, and labels
M-101: duct and transfer openings at rated assemblies
M-501: damper, sleeve, access, and penetration details
M-603: damper actuation, detector interface, fan shutdown, and smoke control coordination
Check: Damper Schedule and Location Documentation
M-001 must list every fire damper, smoke damper, and combination fire/smoke damper with: assembly rating, UL listing number, required access opening, and testing protocol (annual inspection per NFPA 80/105).
Damper schedule must include: damper type, rated assembly rating and type, and access method (ceiling access panel, access door, or duct access).
Damper locations must be cross-referenced between the mechanical duct plan and the architectural rated assembly plan - both sets must show every damper.
Review Risk:
Fire and smoke damper locations are the most commonly missed coordination item - the mechanical set shows ductwork and the architectural set shows rated assemblies, but neither confirms every rated assembly has a damper.
Dampers without accessible inspection openings will fail the pre-occupancy inspection - access must be shown in the permit set.
Combination fire/smoke dampers used in locations that require only a fire damper or only a smoke damper are a specification error that generates a submittal review comment.
Field Tip:
Start with the life-safety plan before the duct plan. If you do not know what assembly is being penetrated, you cannot correctly pick the damper, exception, access detail, or actuation method.
Masterbuild QA Lens
Section 607 covers heating and cooling equipment installed within duct systems - primarily heating coils, cooling coils, and heat recovery equipment. Confirm the equipment type is identified on M-601, the listed rating for the specific installation configuration is cited, and the drain pan and condensate routing comply with the applicable Section 307 requirements. Equipment schedule entries that do not include listing basis and installation reference will generate a comment.
Drawing / Submittal Check
M-001 must list every fire damper, smoke damper, and combination fire/smoke damper on the project, with the assembly rating, the required access, and the testing protocol. The damper schedule should include the damper type, the rated assembly it penetrates, the required UL listing, and the actuation method. A project with rated assemblies and duct penetrations that has no damper schedule will generate a
Common Review Risk
Fire damper and smoke damper locations are the most commonly missed coordination item between mechanical and architectural drawings. The mechanical set shows ductwork, the architectural set shows rated assemblies - but neither set confirms that every rated assembly penetrated by ductwork has the correct damper. A damper coordination matrix that cross-references the architectural rated assembly drawing with the mechanical damper schedule is the best QA tool.
When To Escalate
Escalate when the fire damper schedule reveals a rated assembly penetration that cannot accommodate a listed damper - when the duct size, the assembly construction, or the clearance at the penetration does not match any available listed damper. These situations require either a duct resize to fit a listed damper, a structural modification to the assembly, or an AHJ-approved alternative.
Rated Assembly Coordination
Chapter 607 is the central reference for fire and smoke dampers in duct systems. At project kickoff, build the penetration schedule early: list every rated assembly the duct crosses, the assembly type, and the damper type required before layout is finalized.
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.