WAC Lighting R-660S-N-A R600 Series Hous Shallo New Construction Non-Ic 3" clearance on all sides when insulation is present Certified airtight per ASTM E283, when use with RGK gasket kit Cutout: 6 7/16" Compatible Trims: R-620, R-621, R-622, R-633, R-635,R-636, R-640, R-651, R-656, R-657, R-658