Recessed 4 in. 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.