Kansas Master Mechanical Exam (ICC KGL, 2018 IFGC/IMC)

Per IMC 2018 Section 102.1, where a general requirement conflicts with a specific requirement the specific requirement governs; the 'most restrictive governs' rule applies only where different sections specify different materials, methods or other requirements.

In a high-probability system the design or location of components is such that leaked refrigerant from a failed connection, seal or component will enter an occupancy-classified area other than the machinery room, while in a low-probability system such leakage will not enter the occupied area.

'Labeled' means a label, seal, symbol or mark of a nationally recognized testing laboratory or approved agency that maintains periodic inspection of production is affixed, while 'listed' means inclusion in a published list of an organization acceptable to the code official and 'approved' means acceptable to the code official.

The longest length method sizes each section using the longest length of piping from the point of delivery to the most remote outlet plus that section's load, while the branch length method sizes each branch using that branch's own length measured from the meter (e.g., 15 ft of main + 5 ft branch = 20 ft row).

Per IFGC 404.7 Exception, black steel and galvanized steel piping are not required to be protected against fastener penetration, whereas other concealed piping that is located less than 1-1/2 inches from the framing member face to which wall, ceiling or floor membranes will be attached must be protected by shield plates (steel, thickness not less than 0.0575 inch / No. 16 gage per 404.7.3, extending not less than 4 inches to each side of the framing member per 404.7.1).

Type II uses Class II combustible liquid solvents with flash point at or above 100°F and below 140°F (e.g., 130°F), while Type III uses Class III solvents with flash point at or above 140°F (e.g., a 150°F flash point Class IIIA solvent); Type I uses Class I solvents below 100°F and Types IV and V use Class IV nonflammable solvents.

Per IFGC 503.7.7, a listed draft-hood appliance needs a ventilated thimble not less than 4 inches larger in diameter than the pipe (reduced to not less than 2 inches larger where there is a run of not less than 6 feet of metal pipe in the open between draft hood outlet and thimble), while an unlisted draft-hood appliance requires not less than 6 inches larger, and residential/low-heat appliances 12 inches.

Abrasive materials are moderately abrasive particulate in high concentrations and highly abrasive particulate in moderate and high concentrations (alumina, bauxite, iron silicate, sand, slag), while nonabrasive/abrasive covers nonabrasive particulate in high concentrations, moderately abrasive in low and moderate concentrations, and highly abrasive in low concentrations (alfalfa, asphalt, plaster, gypsum, salt).

Ammonia systems require a minimum emergency ventilation rate of 30 air changes per hour in accordance with IIAR 2, while non-ammonia systems use Equation 11-2, Q = 100 × √G (G = design mass of refrigerant, in pounds, of the largest system with any part in the machinery room).

An eyebrow hood is mounted directly to the face of an appliance above the opening(s) or door(s) from which effluent is emitted, extending past the sides and overhanging the front of the opening, while a backshelf hood is set back from the front of the appliance and closed to the rear, and a pass-over hood is a free-standing backshelf hood low enough to pass food over.

Per IFGC 406.7.1, piping systems with a design operating gas pressure greater than 2 psig are required to be purged outdoors; indoor purging (such as through an appliance burner) is allowed only for systems at 2 psig or less that also do not meet the size and length criteria of Table 406.7.1.1.

Naturally ventilated hydrogen locations are governed by IMC 304.5.1 (including the 12-inch-from-ceiling limitation and the two permanent openings), while in mechanically ventilated locations IMC 304.5.2 requires equipment and appliances having an ignition source to be located so the ignition source is below the mechanical ventilation outlet(s).

IFGC 621.3 limits any single unvented room heater to an input rating not in excess of 40,000 Btu/h, while IFGC 621.5 limits the aggregate input of all unvented appliances to 20 Btu/h per cubic foot of room volume (volume of an adjacent space connected by an opening that cannot be closed may be included).