Why Your 27x27x2 Air Filter Looks Clean but Still Needs Replacing
Your 27x27x2 air filter still looks white — no dust, no discoloration. So it’s still good, right? Not quite. The particles doing the most damage are ones you’ll never see. At DriftHVAC, we’ve pulled thousands of clean-looking filters from systems that were already underperforming. Microscopic allergens, mold spores, and VOCs saturate a filter long before … Read more