It is not difficult to clean the Furnace Filter. It is more difficult to wait for it to dry out before putting it back to the purifier. It takes at least 4 hours to air dry it. Some complain that they see dust collected around the exhaust of this purifier which means these dust particles are not trapped inside the filter, but that does not mean the purifier is not working. It is just working differently than you may expect. Honeywell filter is not designed to capture large visible particles, rather the small invisible ones. Ions are generated by electrical discharge and the ions attach to nearby airborne particles for these units. They will aggregate and fall due to their weight, and that is why dusts are collected at the collector plate for the larger particles. Some however will fall around the purifier including the tire out.

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