The lens area (4 interchangeable lenses are available) is centered on the front, for simpler installation. The lens you choose will stick out a bit. There's also a front infra-red sensor for the remote control, just to the left of the lens. Down below are the front two of four screw thread adjustable feet.
Venting is located on the left, right, and back. This is important: The Vivitek sucks air in from the back, and right (when viewing from the front) side, while the left side is the hot air exhaust. The projector seems to run far cooler than most, thanks to the LED engine.
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I say important, because you can shelf mount this projector, and many will, if desired, thanks to the longer than usual, throw range of the standard zoom. You'll need a little room in the back for the intake for air to come in, but you will have to keep the sides clear too, to limit heat build up overall, and also keep the right side intake free. If some reasonable amount of room isn't available on the left side for the hot air coming out, a lot of it could get sucked back in from the rear, and cause potential overheating. Nothing insurmountable in this, just "pay attention" if you are rear shelf mounting.
Unlike many projectors I review, with my seat 4-5 feet forward and to the right of the projector, this one doesn't cook me, since I had to place it several feet further back. Nice.
All of the inputs and other connectors are on the rear, and above them is the control panel.
H9090 Inputs and Connectors
Time to run though all the connectors, inputs, on the back of the H9090.
Back panel of Vivitek H9090 showing Input panel and control panel
We'll start top left of the back panel, with an RS232 serial port for "old school" command and control.
Next come two 12 volt screen triggers for screen and shades.