Matrox 4Sight XV6 Installation And Hardware Reference page 28

28 Chapter 3: Cleaning the air filter and adding devices to Matrox 4Sight XV6
Warning
3. Slide the cover back and pull up to remove the lid.
Push cover
back
Once you have removed the cover and exposed the motherboard, do not touch
the heat sink or fans while the unit is running, or soon after the unit has been
turned off; they might be very hot.
Pull cover up
Heat sink Fan