Duct Cleaning

[ct2]

in a residential application we put the filter in a regester in the celing and if it is properly maintained the ducts should remain spottless.....ok somewhat clean

commercial wotk where the filter is at the unit ,draws inso much of the airborn dirt that in 2 months time they look sick

Rain -x works on glass , what about sheet metal?

[madhat]

I don't have a bottle of RainX in front of me, but there used to be warning not to use it on interior glass due to the VOCs. Have you heard of this stuff called "ZipLock?" It's metal Channel with extruded clear plastic on it, that has a slot in it. You attach it to the outside air intake with zip screws, then you "Zip" Filter media in it such as PSF1DT from Flanders/Precisionaire. Seems this is where 90% of my dirt comes from. Also nice not to face the attack from "Killer Moths" when changing filters. Some of the filters in the unit are going to have four times the life.

[_knight_]

Also, it could just be me but rain-x is used as a water repellant. Are you using your ductwork underwater? I know that dust and water have an almost identical chemical make-up, but I still dont think it would work. lol