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North Dakota | We have a cheap Honeywell one that we bought 4-5 years ago. I change the pre-filter about every 30 days and the main filters twice a year. It's amazing how much dust is in the pre in 30 days.
The funniest thing about this filter is it has a "gas" sensor, If someone passes gas, it speeds up to full speed for about 20 minutes. Maybe they need one like it on airplanes. | |
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Air purifiers
