I have used K&N automotive fluid and air filters for many years. I was very curious to try this new offering for my home HVAC system. The size of this 14x24x1 filter is just a hair smaller than the 3M disposable MERV-12 filters I've used. I agree with most reviewers who have stated that this may not be ideal if you have a ceiling register filter as that filter is not really a snug fit. It is also slightly heavier than a regular HVAC filter. It is made of a very similar material compared to car filters and has a metal reinforcement on the back. The rim is a plastic shell that feels a bit flimsy. I may need to add an extra gasket on one side to prevent unfiltered air from passing through the system. There is a half inch gap on one side for my custom wall filter register. This filter is rated MERV 11 and should be sufficient for most household needs unless you are severely allergic to very fine particles. I'll go back over the review after cleaning the filter once or twice and reflect on how easy or difficult it is to clean and how well it cleans after a few uses. We tend to change filters every 3 months or so when using an HVAC system, so this test will take some time. Considering that this 14x24x1 MERV-11 reusable filter costs about $40, it will take me about a year to realize savings compared to the standard disposable MERV-11 filter.
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