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G:\Forms & Handouts - 2026\Residential Projects - 2026\2. Furnace in Attic Location (Rev 2026).docx Page 1 of 1 FURNACE IN ATTIC LOCATION Appliances in Attics The following regulations apply to a furnace appliance when located in an attic in accordance with the 2025 CMC 304.4, 904.10 and 2025 CRC R807.1. • Access. At least as large as the largest component of the appliance and not less than 22-in x 30-in. • Passageway Height. When the height of the passageway is less than 6-ft, distance from the passageway access to the furnace shall not exceed 20-ft. • Passageway. Shall be unobstructed, have solid flooring not less than 24-in wide from entrance opening to the appliance. • Work Platform. A level working platform 30-in deep x 30-in wide at front of service side of unit. • Lighting and Outlet. A permanent 120-volt receptacle and light located near the unit with the switch controlling the lighting fixture located at access opening. • Furnace. Upright furnaces may be installed in an attic or furred space more than 5-ft in height, provided the required listings and furnace and duct clearances are observed. Horizontal furnaces may be installed in an attic or furred space provided the required listings and furnace and duct clearances are observed. • Clearances. Minimum clearances from combustibles shall comply with the listing of the appliance. 20-FT MAX. PASSAGEWAY IF HEADROOM IS LESS THAN 6-FT ATTIC FURNACE MINIMUM 30-IN DEEP AND WIDE IN FRONT OF FURNACE ACCESS BY AN OPENING AS LARGE AS THE LARGEST PIECE OF FURNACE AND IN NO CASE LESS THAN 22-IN BY 30-IN LOCATED IN A HALLWAY OR OTHER READILY ACCESSIBLE LOCATION LIGHT SWITCH ATTIC FURNACE ELECTRICAL RECEPTACLE AND LIGHT FIXTURE MINIMUM 24-IN WIDE SOLID FLOORING FROM ACCESS OPENING TO FURNACE WORKING PLATFORM *TRUSS SYSTEM SHALL BE ENGINEERED FOR NEW FURNACE INSTALLATION 30-IN MIN. VERTICAL CLEARANCE FROM TOP OF CEILING FRAMING MEMBERS TO UNDERSIDE OF ROOF FRAMING MEMBERS