Idaho - HVAC SPECIALTY JOURNEYMAN EXAM

IFGC covers natural gas piping at 125 psig or less, but LP-gas piping only at 20 psig or less (except per Section 402.7).

Category I operates with nonpositive vent static pressure and avoids excessive condensate; Category IV operates with positive vent static pressure and produces excessive condensate.

Low-heat appliances have flue entrance combustion temperatures of 1,000°F or less; medium-heat appliances exceed 1,000°F but do not exceed 2,000°F.

A hot water heating boiler circulates hot water at no more than 160 psig and 250°F; a steam heating boiler generates steam at no more than 15 psig.

A direct-vent appliance draws all combustion air from outdoors and discharges all flue gases outdoors; a standard vented appliance (e.g., Category I with Type B vent) uses indoor air and a conventional vent system.

Where there is a conflict between a general requirement and a specific requirement in the IFGC, the specific requirement governs.

Normal work requires a permit before commencing; emergency appliance/equipment replacement allows work to start immediately but the permit application must be submitted within the next working business day.

Private garages require a minimum clearance of 6 feet above the floor; public garages require at least 8 feet above the floor, or 1 foot higher than the tallest vehicle door opening if vehicles pass under the appliance.

The Standard Method requires 50 cubic feet of indoor volume per 1,000 Btu/h of input; the Two-Permanent-Openings Method requires each opening to have at least 1 square inch of free area per 4,000 Btu/h of total input.

Brazing uses a nonferrous filler metal with a melting point above 1,000°F (but below the base metal); soldering uses filler metals with a melting point below 1,000°F.

Underground inspection is made after trenches are excavated and piping is installed before backfill; rough-in inspection is made after framing and fireblocking are in place but before wall/ceiling membranes are installed.

Existing installations lawfully in place at code adoption may continue without being required to comply with all current IFGC requirements; new installations must fully comply with the current code.