ICC M1 case studies
ICC M1 · Put your knowledge to work in context.
The ICC Commercial Mechanical Inspector (M1) certification is one of the credentialing exams offered through the International Code Council's certification program, which ICC describes as "one of the most historic and prestigious credentialing programs for construction codes and standards." The M1 is aimed at professionals who inspect or review mechanical work in commercial buildings: mechanical inspectors, plans examiners, code enforcement officers, and trade professionals who want to document mechanical code competence. The exam is multiple choice and is organized around four content areas: general administration, definitions and referenced standards; heating and ventilation equipment and appliances; air conditioning, refrigeration and cooling systems; and duct systems, chimneys, vents and combustion air. The ICC M1 case studies are 5 cases and about 2,414 words.
1The 'Like-for-Like' Furnace Swap
A single-family homeowner calls for a final inspection on a basement furnace changeout. The original unit was 80,000 Btu/h natural draft; the new one is a 120,000 Btu/h induced-draft Category I furnace in the same closet, and the contractor also cut in a new 14-inch return trunk.
456 words, about 2 min2The Listed Unit Heater and the Field-Built Shield
During a warehouse tenant-improvement inspection, the inspector finds a gas-fired unit heater suspended in a storage area. The unit bears a testing-agency label, but the manufacturer's installation instructions state the appliance is 'listed for commercial and industrial heating only' and require 18 inches to combustibles.
467 words, about 2 min3The Furnace Closet That Cannot Breathe
A 4 ft by 4 ft by 8 ft closet contains an 80,000 Btu/h induced-draft Category I furnace and a 40,000 Btu/h natural-draft water heater with a draft hood. The closet door is a louvered bifold with 60 square inches of free area, opening into a central hallway.
499 words, about 2 min4The Duct Through the Two-Hour Wall
In a two-story office tenant finish, the contractor runs a 16-inch by 10-inch galvanized supply duct through a 2-hour fire wall separating the suite from the adjacent parking garage. No fire damper is installed; the contractor argues the duct is 24-gauge steel and 'the wall is concrete on both sides, so nothing can burn.' The same job uses the ceiling cavity above a suspended ceiling as the return-air plenum; the cavity contains wood floor joists, kraft-faced fiberglass batts, and exposed foil-faced polyisocyanurate board.
439 words, about 2 min5The Condensing Furnace on the Old Masonry Chimney
A 1955 house has an unlined exterior masonry chimney serving a 40,000 Btu/h natural-draft water heater and an 80,000 Btu/h natural-draft furnace through a wye common vent. The furnace fails and is replaced with a 60,000 Btu/h Category IV condensing furnace.
553 words, about 3 min