Has anyone done any testing on switching the fan from an exhaust to an ingress orientation? I am thinking about doing that, after cleaning out the heatsink (full of dust) and putting a dust filter over the top if I do switch the orientation. Ultimately what I'm trying to do is get better temps over longer periods of time, with less maintenance. This is the first time I've had to clean dust out of the heatsink, but it's taken about an hour to do. I more like the idea of periodic cleaning of the dust filter instead 
EDIT: The other option I'm considering is just applying more dust filters to the present intakes (on the sides), and at the front; luckily 92mm dust filters mostly line up with the screws that hold the sides onto the main frame. That said, a single 92mm filter leaves a small gap near the rear end of the side intakes, about 1cm wide, where there's no filtration.
EDIT: The other option I'm considering is just applying more dust filters to the present intakes (on the sides), and at the front; luckily 92mm dust filters mostly line up with the screws that hold the sides onto the main frame. That said, a single 92mm filter leaves a small gap near the rear end of the side intakes, about 1cm wide, where there's no filtration.
The heatsink is specifically designed for the fan to run as an exhaust instead of pushing air through the top. While you can run it this way it was designed like this to have the highest thermal efficiency at low fan speeds. If you run it reverse you'll find that the fan will need to run at much higher RPMs to keep the same temps. I guess if noise is not an issue for you there is no harm in trying since the controller will compensate for reduced thermal efficiency...I wouldn't do this in Turbo mode though since even at 5-6k RPM that fan might not be able to keep up in this configuration.