The product quality is good, for your basic $1 fiberglass HVAC filter. The cardboard shipping box was strong and protected the filters from being crushed during shipment.The big box hardware stores have greatly reduced inventory in these inexpensive air filters. They no longer stock my 10"x20" (standard for many apartments), the 16"x25" or the 14"x20". What they do stock in these sizes are expensive $15 filters, which my HVAC contractor does not recommend.
These fiberglass filters will keep your A/C cooling coil (or Heat Pump coil) from getting dirty or clogged. That is the purpose of a 1/2" or 1" deep filter. If you want improved air filtration, install a 4" deep HEPA Air Filter Housing. Forget the $15 and 1" deep filters at the big box hardware stores. They perform poorly for you and provide big profits for the retailers.
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