IMO ducts should be cleaned after construction and then every 5 to 10 years or so. If you have a good air cleaner and purifier, you don't need a cleaning once you get a good post construction cleaning.
Good filtration is a 5 inch media system or better.
Air purifier would be a downstream product by RGF, Dust Free, etc. that produce plasma streams.
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i think the plasma generating products have been largely de-bunked. I'm not saying they are doing harm, but I think the benefits appear to have been greatly exaggerated. I think COVID kind of put those claims to the test and none of them ended up passing that test
also, 5 inch media system? for a residential unit? in this economy?? holy BHP batman
Meh. Charlatans tried to use them for something that is beyond their abilities.
They absolutely rock for daily allergens. I'm highly allergic to cats. Asthma, congestion, etc. Slap in a purifier and whammo. No allergies. My wife gets to keep her cat.
Don't be a tight wad. Get the appropriate setup.
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