Review on Complete Ventilaider Electrostatic Installation Registers with Enhanced Filtration by Dustin Lannan

My son is severely allergic to dust and pollen. We moved into an old house and even with the new HVAC unit, there is a lot of dust in the old vents. I placed them on the outside of the vents and noticed that if I just tape off the corners, top and bottom, but not in a full rectangle, it only leaves a tiny space for more air to escape. I have no problem with the airflow going through the filter when I do this and I also notice a BIG difference in the amount of dust in the room. I use a faster mop EVERY night to check the amount of dust and it's much better now. I also noticed over the weekend that my son no longer coughs, so it works. Thanks very much!