From 7490 Access Door For easy access during e.g. inspections and maintenance work. Can be installed in walls and ceilings. Can be used in wet rooms and areas. Opens and closes with a light push. White plastic.87-3877: Hatch dimensions: 200 x 200 mm. Frame dimensions: 217 x 217 mm.87-3878: Hatch dimensions: 300 x 300 mm. Frame dimensions: 317 x 317 mm.