The in-ceiling LGH-50RVX-E Lossnay Fresh Air Energy Recovery Ventilation system provides the ultimate in energy efficient ventilation to ensure your home or office has a constant supply of healthy, fresh air. Air volume: 139l/s. (WxDxH, mm) 888 x 1016 x 331. Weight: 33kg. Operated by the simple to use PZ-62DR wall mounted backlit LCD controller.