INTEGRA 4000 Series fire-rated riser doors

INTEGRA 4000 Series concealed riser doors are custom made to the required specification to be visually discreet and fit seamlessly in masonry walls, shaft walls and drywall partitions: up to 4 hour fire rating (third-party certified by CERTIFIRE); 35dB acoustic rating as standard; smoke sealed; airtight to Part L; powder coated with a matt RAL