What kind of filter

[papi]

Hi all,the cold return registers are located on the floor and i need to get some kind of filter to install on this metal grills [ 14x 20 or so] i have good quality filters install on the furnace but i like to establish a 'first line of defence' agains dust and dirt, besides a pantyhose what else is there that i can use to be an effective filter and same time wont restrict too much the air flow.
Thank you very much Regards papi

[Ed Imeduc]

Dont do it, let them as they are. Use a good pleated filter about a MERV 5 can add a little filter spray coat on the intake side of it . New one every 30 to 90 days. Are put in the 4"or5" airbear filter. But dont have one in the register and one in the furnace.


ED ;)

[hvac01453]

Absolutely!....If for some reason your hellbent on filtering the duct, use a cheap throwaway fiberglass.

[papi]

Thanks very much for replies,i guess it is a NO NO to filter the intake,is this an air flow issue? tnx again

[hvac01453]

Yes!...........

[Jay11J]

One filter at the furnace is fine.. If you put another, then yes you are going to have air flow problems.

If your ductworks are very dirty, then hire in a duct cleaner, and then use a good media filter.