P87 AT Features: Air Tight IC and Non IC. Meets Washington State Energy Code requirements P8587 01 Accessory Ceiling Gasket or caulking around plaster frame opening. UL and CUL Listed for damp locations and through wiring. Integral Romex clamp. Tool less can adjustment for varying ceiling thickness. Full reflector design eliminates light leaks. Rated for 8 #12 90 degree conductors 4 in/4 out . US Patent #5758959, 5857766, 6004011. Can be installed in ceilings from 0.5 to 2.5 thick. Slotted, interlocking bar hangers securely span 24 T bar spacing. 6.875 Ceiling Opening. 7.875 x 10.75 Plaster Frame. 7.5 Recessed Depth. 0.5 and 0.75 Pryouts. Construction: New Construction.