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If you want to pay PLN 150 for two filters on the air intake and supply - pay. If you want to pay PLN 15 for a conical filter for an exhaust air valve - pay. We don't want to, we'll make it ourselves. This film contains detailed instructions on how to make cheap conical filters for exhaust air valves and how to make cheap filters for the air intake and supply. Instead of PLN 800 per year, the total will cost us PLN 40. 00:00 - introduction, how much it costs and how much you can save 01:48 - G4 filter fleece - how much it costs 03:24 - how to make a cheap conical filter for an air intake and supply valve step by step and what it looks like after installation 15:08 - how to make a cheap main recuperator filter for the air intake and supply 23:39 - conclusion and speculations, is it worth it