Title: Take care and read 11.5x11.5 not 12x12
Product review: Maybe I was so grateful that somebody has 12x12x1 air filters that I didn't catch the 11.5x11.5 part. Why is that? I'm not familiar with all the in's and out's of HVAC's but from my experience with air filters is that there are standard sizes. Very annoying to take out the old air filter and put in the new one to see that it's not the same size and that there's room for a lot of play. I hope that the suction of the vent will make up for the space around the filter and pull the air filter to it to minimize the air going in that's not passing through the filter. Live and learn. If you are looking for a filter that fits perfectly into a 12x12 opening, this is not the one.
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