<p>The under floor installation unit has a main frame [7] set into an aperture. This is of a flexible height adjustable foam material. On top of this is a levelling frame [2] that has a central cover plate [3] secured with small screws. Set into the base of the aperture is a fixing plate [8] that has fixed studs [6]. The levelling plate is adjusted using screws set at each corner [5].</p>
