The installation and use of PETRAL raised floors are more practical thanks to the range of tools and accessories available. The lifters are useful tools to lift the panels easily. In this way it is possible to inspect the underfloor space or to make replacement and modifications. Steps and ramps can solve problems related to differences in level, while laminate lateral closing elements can be used to close off the underfloor plenum. Finally, there are equipments to better exploit air-conditioning systems, such as grills to make air flow from underfloor, and accessories for electricity and telephone connections, such as service outlet and electrical and/or telephone standing turrets.