This is in between the Concreate roof and Plaster ceiling, and if fire hazard it will start from room as fire can't go thro concreate, right?
If in the room, everything in the room are the possiable of fire hazard already...only thing I could imaging will be the heat or wire from downlight as it will be the only item on the plaster ceiling.

* It called "bubble wrap"? (pop pop plaster)

heard that hanging a gourd (can be found in chinese/ buddhist religious store) near the window/ door/ place near the hottest space, or putting a white/ transparent crystal, might help to adjust the room temperature.

growing/hanging some pot plants near outside windows might also help.

guys, i just installed ventilation ceiling on today.. I could feel the hot air is reduced. Air flow better..
I'm think install one more ventilation window fan flow in the cool air from outside during night time.. any suggestion?

KIntos, why you need remote control?