The problem with that answer is the air has to come from somewhere. So whether the fan is pushing out or pulling in, there is still an airflow through the projector. And fans pull air through any and all openings in the projector.
I once had a projector on my bench that was never cleaned in the 2 years it had been running. Every crack, crevice, vent and even the openings around the connectors were caked with dust.
So regular cleaning of the exterior vents is not only a good idea but recommended by all the manufacturers.
As for which way the fan was actually blowing, I don't know. I would look for dust accumulation in the vicinity of the fan, that might be a clue. Also look for the nearest vent that might supply the air for that fan. That is usually an intake, but not always.
In the end, if the projector starts giving you overheat errors, the fan is probably installed backwards. If you see no ill-effects, you either got it right or it doesn't make much difference with particular fan.
|Quote (mikerose on Dec 7, 2011 2:32 PM):|
I am a pc tech . I would put the fan blowing out. reason being is dust. Dust can get in a product and destroy it. Dust will combine with moisture in the air and short ciruit the electronics.
[Edited by sheridan on Dec 7, 2011 at 3:57 PM]