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22.214.171.124 Recessed Equipment
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Lighting fixtures; heating, ventilating, and air-conditioning equipment, including wall heaters, ducts, and plenums; and other equipment shall not be recessed in such a manner as to affect the insulation thickness unless
- the total combined area affected (including necessary clearances) is less than 1% of the opaque area of the assembly,
- the entire roof, wall, or floor is covered with insulation to the full depth required, or
- the effects of reduced insulation are included in calculations using an area-weighted-average method and compressed insulation values obtained from Table A9.4.3.
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