I have an Epson projector on the ceiling of my classroom and have no sound coming from it? another teacher reset the projector and since have not had sound

Yes, according to press reports. But bullet shrapnel hit one, and ceiling debris hit two other students.

https://www.nytimes.com/2018/03/14/us/teacher-gun-accidental-discharge.html

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I'm not familiar with your specific model, but are the units LCD or DLP? What I've seen in LCD projectors used in schools, museums, etc. that are left-on for several hours per-day, is that the UV filters in the optical blocks will fail. They usually change to an amber-brown color and block most of the light. It's the equivalent to putting sunglasses on. Do the units also exhibit a greenish-yellow tint instead of proper color?

First suggestion is checking to make sure that the tray/chains are secure - that it's not going to fail at at a point of connection either at the ceiling or point where the chains fasten to the tray. The tray must be strong enough for the weight of the projector (most InFocus classroom projectors are not that bulky and heavy).
Hanging anything with weight from the suspension ceiling braces is not recommended. If possible, having the wire/chain continue thru the ceiling panel (a small inconspicuous hole can be made through the panel) up to actual ceiling joists or whatever material the ceiling system itself is fastened to is best & the most secure. I've used steel aircraft cable (available at any Home Depot or hardware store) in place of chain, partly because it only requires a small pencil-sized hole thru the ceiling panel, hardly noticeable.

Most hanging fixtures (theatrical lights, projectors, etc.) have a secondary/backup safety cable or strap system should the main fasteners fail. In this case, if the tray and ceiling connection is secure, a safety strap holding the projector onto the tray so it's not sitting up there loose or able to be knocked out at all should be used. This also will help keep the projector's aim aligned to your screen should something bump the tray, you won't have to readjust it. (See this link attached for an example of a strap securing a projector).
(In all cases, if you have a building or school district maintenance administrator or someone who's job description requires them to be aware of state or district safety regulations/OHSA rules, they should be consulted to make sure you're following any safety issues that may apply specific to your classroom/student needs.)

Use a long focus lens if you can get one.

Hi There Teacher!
the air filter unclips on the left hand side, lens facing out.
after vacumming out the filter see below for filter reset counter procedure
Good Luck!
Turn the projector on and reset the filter time using the FILTER TIME item in the EASY MENU. Before taking care of the air filter, make sure the power switch is off and the power cable is not plugged in, then allow the projector to cool sufficiently. Taking care of the air filter in a high temperature state of the projector could cause an electric shock, a burn or malfunction to the projector. Use only the air filter of the specified type. Do not use the projector without the air filter or the filter cover. It could result in a fire or malfunction to the projector. Clean the air filter periodically. If the air filter becomes clogged by dust or the like, internal temperatures rise and could cause a fire, a burn or malfunction to the projector. WARNING Please replace the air filter when it is damaged or too soiled. When you replace the projection lamp, please replace the air filter . An air filter of specified type will come together with a replacement lamp for this projector . Please reset the filter time only when you have cleaned or replaced the air filter, for a suitable indication about the air filter. The projector may display the message such as ?gCHECK THE AIR FLOW?h or turn off the projector, to prevent the internal heat level rising. NOTE (1) Press the MENU button to display a menu. (2) Point at the FILTER TIME using the ??/?? button, then press the button. A dialog will appear. (3) Press the ?? button to select RESET on the dialog. It performs resetting the filter time.

it's overheating. clean it out with canned air. dust keeps in the heat that the projector is trying to expell. it also decreases the air flow.

You need a wireless presentation remote that has a transmitter that plugs in to the back of the computer. This can be used to advance the slides. Make sure you get one that states the distance you need.

Let me know if that helps.

-Jeff

Hi there

I just drew the users manual and you should do the following:

Go into the setup menu and choose mirror - then just scroll left or right on the mirror and your image will change as you do this.

You need to change it to front/ceiling in the menu function of the projector.