/ Field knowledge · IMC 607.2
“Install per manufacturer” is not a damper detail.
A damper shown in the right wall is not automatically the right damper. IMC 607.2: install per the manufacturer’s instructions, the listing, and 607. The detail cannot be generic. Sleeve, retaining angles, breakaway, access, actuator, detector, orientation, and the plane of the rated assembly have to match the listed condition. A static damper in a fan that stays on is the same class of miss as a fire damper that closes and defeats smoke control.
Educational 2024 International Mechanical Code (IMC) 607.2–607.2.4.1 from Daily Code Talk. Confirm the adopted edition. Distinct from 607.4 access and static vs dynamic CRD (607.6). This is not a damper schedule. Packet: 607.2 PDF · ES.
- 607.2: fire, smoke, combination, and ceiling radiation dampers installed per manufacturer instructions, listing, and IMC 607.
- 607.2.1: if a fire damper would interfere with a required IBC 909 smoke-control system, approved alternative protection. If normal HVAC ducts or dampers serve smoke-control mode, their expected performance belongs in the IBC 909.4 rational analysis. A damper that closes at the wrong time can defeat pressurization, exhaust, makeup, purge, stair or elevator hoistway pressurization.
- 607.2.2: fire dampers for hazardous-exhaust duct systems comply with IMC 509 — not a normal duct with a damper added at the boundary. See 509.
- 607.2.3: fire dampers and CRDs listed for static systems only where the HVAC system shuts down automatically during a fire. If the fan continues, the static assumption is wrong.
- 607.2.4: mechanical, electrical, and plumbing controls cannot be installed in air-duct systems except wiring directly associated with the air-distribution system, where allowed by IMC 602 and limited to 4 feet. 607.2.4.1: those controls cannot be installed through fire, smoke, combination, or ceiling radiation dampers unless allowed by the manufacturer and listing.
On the set: protected assembly, damper type, listing, static or dynamic, fan shutdown sequence, smoke-control role, hazardous-exhaust applicability, control routing, access. Four questions: what is it protecting, what is it listed for, what happens in fire/smoke mode, and can anything routed through it interfere?
Generic “F/S damper per manufacturer”
Or a static damper on a smoke-control fan. Or thermostat wire pulled through the damper. The symbol survived; the listing did not.
Source: Daily Code Talk — IMC 607.2 · ratings: 607.3 · access: 607.4 · CRD mode: 607.6 · 509: hazardous exhaust.
What to send
The damper detail (or typical), whether any system stays on in a fire, and whether controls or wiring pass through the damper.
If the typical only says “install per manufacturer”
Send the typical and the sequence. MasterBuild will say whether 607.2 still has a generic detail — or 607.2.3 still has a static damper on a fan that stays on.
Send Project Background+1 (786) 398-6940 · osmany.portal@masterbuildconsulting.com
MasterBuild provides engineering services under a written scope. Nothing on this page is project-specific engineering advice, a code interpretation for your project, or a representation about permit approval. Confirm the adopted edition. Listing, IBC 909 interference, static-system limits, the 4-foot control-wiring exception, and “no controls through the damper” are 2024 IMC 607.2 education from Daily Code Talk — not a damper design. This page is not legal advice.