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Being MORE than a conscientious recycler, I am always compulsively thinking about how to use every single item that crosses my path, if at all possible, because I hate America's waste:
Replace the filter every 3 months or more often if cooking/frying often. It helps to prevent vent fires. (Make lint layers as even as possible and remember to check the "filters" often to gauge how often to change with the "free" ones you have made!)
Most exhaust openings can be covered by some sized picture frame. The whole homemade frame and filter then slides out of the more permanently attached frame-brackets for easier filter replacement.
With a little thought, the whole thing can be attractive and fairly cheap! Don't over layer or overfill with lint, remembering that the grease filled air must be able to be pulled through it for filtering. Think of the thickness as like the better A/C filters one must purchase. The thin A/C filters don't work as well, but, then one doesn't want the filter to be too thick that it destroys the fan, either.
By Lynda from Richardson,TX