Halo H99TAT Recessed Housing, 4-3/8 in Ceiling Opening, Recessed Mounting, Steel | The H99TAT is a small aperture Non-IC AIR-TITE housing for providing accent and task lighting. The H99TAT is designed for use in non-insulated ceiling or for insulated ceilings but insulation must be kept 3 in from all sides of the housing. Non-IC Housing is AIR-TITE but insulation must be kept 3 in away from all sides of housing.