Roof Hatch 12 Volt exhaust fan with the switch. 
Vent manually opens & includes removeable flyscreen

Specifications

Fits into hole 355mm X 355mm (14 Inch x 14 Inch).
It will cover a roof thickness up to 55mm thick.
Internal cover protrudes only 5mm below the ceiling.
External Lid sits 80mm above roof when closed.
Upper Roof Flange 419mm X 419mm
Inner Ceiling Flange 405mm X 405mm

SMOKED LID