ICC M2 case studies
ICC M2 · Put your knowledge to work in context.
The ICC Commercial Mechanical Inspector (M2) certification is a professional credential offered within the International Code Council's credentialing program, which the ICC describes as existing to "Further your career and growth." It is intended for code enforcement professionals who inspect mechanical systems in commercial buildings - work that spans heating and cooling equipment, duct systems and ventilation, combustion air and venting, refrigeration, hydronics, and fuel piping. Candidates are typically inspectors, plans examiners, or tradespeople moving into code enforcement who need to demonstrate command of the commercial mechanical provisions of the International Mechanical Code and related I-Codes. The ICC M2 case studies are 5 cases and about 2,724 words.
1Rooftop Unit Replacement Without Permit Revision
A contractor is replacing a 12-year-old packaged rooftop unit serving a small office suite. The original permit, issued 14 months ago, covered a like-for-like swap of a 5-ton unit at 2,000 cfm.
497 words, about 2 min2Short-Cycling Furnace After Duct Modification
A 90,000 Btu/h input, 80% AFUE upflow furnace in a basement serves a 1,800 sq ft single-story house. The homeowner reports the furnace runs for 4 minutes, shuts off, and restarts after about 6 minutes; supply registers feel warm but weak.
549 words, about 3 min3Vent Connector Routing Through a Chase
A natural-draft, Category I gas-fired water heater (40,000 Btu/h) and a Category I furnace (100,000 Btu/h) share a single-story house with a 6-inch diameter Type B vent serving both through a common vent. The water heater connector runs 12 feet horizontally with two 90-degree elbows before entering the common vent; the furnace connector runs 4 feet with one elbow.
593 words, about 3 min4Walk-In Cooler Condensate and Clearance
A 10 ft by 12 ft walk-in cooler is being installed in a restaurant back-of-house. The condensing unit is a 3 hp air-cooled unit placed in a mechanical alcove 30 inches from a wall on one side, 12 inches from a wall on the other, and 18 inches below a ceiling soffit.
506 words, about 3 min5Boiler Replacement and Existing Near-Boiler Piping
A 30-year-old cast-iron atmospheric boiler rated 150,000 Btu/h input is being replaced with a 120,000 Btu/h input condensing boiler in a basement mechanical room. The existing near-boiler piping is black steel with a single circulator on the supply, no primary/secondary separation, and a compression tank connected at the top of the boiler.
579 words, about 3 min