Recessed 4" aperture ultra-shallow housing for use with LED integrated trims. Installs from below the ceiling and suitable for 2x4 residential or shallow plenum commercial construction. Suitable for direct contact with insulation; airtight rating reduces airflow between living spaces and unconditioned areas providing additional energy savings. Use with compatible Halo® LED integrated trims and modules providing general, task and accent lighting when energy savings, long life and optical control are required.