An inside designer square vent/grille for use with exhaust fans. It is normally placed on the ceiling or wall.
It comes in 150mm (comprehensive dimensions below).
The vent comes with a built in flyscreen mesh. To install simply remove the decorative cover as pictured below. Then remove the flyscreen and screw into the wall via the pre drilled holes. Once the body is securely in place you can reattach the decorative cover.