I finally got around to replacing the last 2 fans in the projector. I also removed the filters & grills to increase airflow.
Now with the projector running you can feel air being pushed through the unit — there is more airflow. This is also indicated by a lower running temperature, it was 5C lower with the new fans.
The problem is, they are still too loud. 🙁
I’m going to put a resistor in the power line to slow the fans down. This should further reduce the speed (and noise) of the fans. I need to also check what the power being supplied to the fans actually is. I have read somewhere else that its 20V, not 12V. This may make a difference in the performance of these fans — they certainly are not a ‘quiet’ as the PC Power and Cooling “Silencer” fans I’ve used in the past for my old ECP and they are rated almost the same.
Either way, I’m not satisfied yet — we’ll just have to see what else can do. Opening up the vent holes at the back of the projector may also be something worth doing to increase airflow through the unit.