The manhole cover PRO+ Thermal System is made of hot-dip galvanized steel or stainless steel. The frame is equipped with a special frost and weather seal to protect against seepage and odor leakage. The frame is fixed by casting at floor level and then the tank can be filled and inserted into the frame. Filling of the tub is possible with stone, tile, cement, resin, granite, wood and hard flooring or other materials. The "thermal" version is equipped with insulating panels, which can be easily inserted into the frame after assembly. Areas of application: For both indoor and outdoor floor ducts where fire protection is required. Each manhole cover comes with tightening/lifting keys and an assembly manual. Dimensions: Customized sizes can be produced in every dimension upon enquiry.