This ceiling form has hanging frame or attach the lid material. This form is usually knows as conventional ceiling. It is already heavily modified into a form or a curved ceiling rise.
In general there are three basic forms of ceiling.
For installation of a ceiling fan between floors leaves little choice for this task since it cannot be accessed easily from above or below the ceiling since the upper floor is directly above the ceiling box. Cutting a hole in the floor or knocking out the ceiling is not prudent just to place blocking above a ceiling box. Medallions are available but the added expense, labor and time can be prohibitive, especially if the medallion is painted to match the ceiling. The brace type of products that are sold today are an alternative though they work better in theory than in practice as the old ceiling box needs to be removed before they can be installed. Home Depot has a web page devoted to this process which they claim can take ½ a day to complete.
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