Air Health UV Home Air Sanitizer
They do work, but many people don't replace the lamps as needed and more important most people don't need what they do. Sort of like selling refrigerators to the Eskimos.
Answer:
We did use a dehumidifier and that helped. We also worked on the eave troughs, put in a new concrete driveway to slope away from the house (to the tune of $4500), and put extenders to take the water away from the house. The house is brick and was built in 1952, so it isn't as air tight as houses built later. We took up all carpet in the basement and put down that two part expoxy paint. I hope my nephew benefits from all of these efforts. My father-in-law (who built the house) had a new furnace installed with a Space Guard furnace filter. It is in still the Saginaw Valley, and in my opinion, the pollen havennow I'm confused. It is impossible for pleated filters to ALWAYS be more restrictive than flat filters. It has to depend on the medium (the material used to make the filter) and how clogged with dust the filter gets. In my experince, straight filters allow a much higher volume of dust particles to "blow by" the filter because the filter does a poor job of trapping the particle with most high volume high speed fans used today with modern whole house central air conditioning systems. Respectfully, I have tested 20 different brands/types of pleated filters and 6 or 7 brands/types of fiberglass/polyester filters. For 1" thick filters, the pleated filters have ALWAYS been more restrictive! I tested 20" x 20" x 1" filters at 800 CFM, to keep it aples to apples. The fiberglass/polyester filters varied from .075 inches water gauge to .1 inches water gauge (IWG or IWC) pressure drop. The 1" thick pleateds were from .20 IWG to .21 IWG. Typically installing 1" thick pleated filters in the average installation will drop overall air flow 10% to 20%. I measure air flow with a flow hood, hot wire annemometer and rotating vane annemometer. These are accurate, sensitive, expensive instruments. I am certified air balance technician by the National Balancing Institute. If you install a 4" to 6" thick pleated filter in the duct system, you can reduce the pressure drop significantly to about .08 IWG to .1 IWG, but that is not a do-it-yourself project. It is also not apples to apples. But, yes, the pleated filters catch a LOT more dirt. And they get dirty faster and should be replaced at least as often as fiberglass filters.