The ECO-RIWA Floor Manhole System is made of aluminum. The frame is fitted with a frost and weather seal. The cover is walkable and is finished with a non-slip knurled plate. The frame is fixed by pouring concrete leaving it raised in relation to the floor; the cover can then be inserted. The cover is fixed to the frame by means of tightening screws and can be removed with a special lifting key provided. Load: Class A15 according to EN 124. Material: The frame consists of a 2 mm angle profile and the cover of knurled aluminum sheet 3-5 mm. Areas of application: Raised manholes for floor-level ducts, for both indoor and outdoor use. Opening: Each FF manhole cover is supplied with clamping/lifting keys and an assembly manual. The tub is attached to the frame using anchor screws. Dimensions: Customized sizes can be produced in every dimension upon enquiry.