Sue and I use the On Time Air Filters scheduled delivery service.  Not too surprising, I suppose.  We received our replacement filters today.  I replaced the filters but noticed something about the old one...it's bowed out.  Here are a couple of photos:

So what happened?  Simple...the filter did a great job and grabbed lots of dirt, dust and Daisy hair (by the way, the filter media was pure white when installed).  But, we needed to replace the filter sooner.  There was so much build-up on the filter that air pressure from the blower fan pulled the filter inward.

I changed the filter three months ago, but I'm switching to an every-two-month schedule based on this.  Imagine what this would have looked like after another month...or an entire year!  This is why you need to change your filters regularly.

Filed under: Mark Leffers • MERV • HVAC • Air Filters • Mistakes