So we use a desktop in the restaurant of a motel and it gets mad dirty and we need maintenance often and also computers doesn't last rlly long, I want to know if there's a type of computers without fans and with a case that doesn't let dust in

Get dust filters.
Clean them regularly.

No fans would mean no airflow. No airflow means no cooling. No cooling means overheating parts. Overheating parts means pc won't work.

The guy that clean motel pcs said there was a new computers without fans, but he sell things fucking expensive so I'll buy it he wants 500 usd for a desktop core 2 duro 1.80 with 60 gb sdd and windows xp

there are vesa mounted comps without fans



r u high

Only occasionally.

Anywho! I was being a little sarcastic. I know, its hard to portray through text

@OP
You can get like a Lenovo M79 or something similar.

http://shop.lenovo.com/us/en/desktops/thinkcentre/m-series-sff/m79-sff/
or
http://shop.lenovo.com/us/en/desktops/thinkcentre/m-series-tiny/m53/