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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
  1. the total combined area affected (including necessary clearances) is less than 1% of the opaque area of the assembly,
  2. the entire roof, wall, or floor is covered with insulation to the full depth required, or
  3. 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.
In all cases, air leakage through or around the recessed equipment to the conditioned space shall be limited in accordance with Section 5.4.3.

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