Chapter 1 Preparation — Precautions for useENGLISH - 17rCautions when setting up the projectorf To install and use the projector via a method that does not use the adjustable feet in a floor standing installation, fix theprojector using the four screw holes for ceiling mounting (as shown in the figure).(Screw diameter: M4, tapping depth inside the set: 10 mm (13/32"), torque: 1.25 ± 0.2 N·m)Make a clearance of at least 12 mm (15/32") between the projector bottom and setting surface by inserting spacers(metallic) etc. between them.f Use the adjustable feet only for the floor standing installation and for adjusting the angle. Using them for other purposes maydamage the set.Screw holes for ceiling mount (M4)Adjustable feetThe positions of screw holes for ceiling mount and adjustable feetf Do not stack projectors on top of each other.f Do not block the ventilation ports (intake and exhaust) of the projector.f Prevent hot and cool air from the air conditioning system to blow directly to the ventilation ports (intake and exhaust) of theprojector.500 mm (20") or longer 500 mm (20") or longer 500 mm (20") or longer100 mm (4") or longerf Do not install the projector in a confined space.When it is necessary to install the projector in a confined space, install the air conditioning or ventilation separately. Exhaustheat may accumulate when the ventilation is not enough, triggering the protection circuit of the projector.SecurityWhen using this product, take safety measures against the following incidents.f Personal information being leaked via this productf Unauthorized operation of this product by a malicious third partyf Interfering or stopping of this product by a malicious third partyTake sufficient security measures. (x pages 95, 113)f Make your password difficult to guess as much as possible.