We have run a PC for 9 months 24 hours a day, 7 days a week without any overheating challenges.
Without a doubt, all new tools present some risk. Do they work? What are the downsides?
Can science help?
Using advanced Finite Element Analysis (FEA) technologies from ThermoAnalytics, an unprotected computers heat generation is modeled as

The same computer with a Dirt Bag filter...

The bottom line is that there is a small increase of approximately 1º C on the video card.
Upon examination, you'll note the protected computer has a cooler top. This is due to the Dirt Bag's influence on radiation heat transfer. In this case, the Dirt Bag reflects a minimal amount of heat back, hence the cooler external thermal appearance.
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