Hi,
I have a very old furnace/air conditioner and it uses a very thin elastrostatic air filter with the size 25"x20"x1/2". Most stores like Home Depot do not carry such a size anymore. Could someone recommend where I can find this size? I live in Toronto Canada if someone knows a store there that I can go to, or if someone knows where I can order it from I don't mind to pay some shipping. Thank you.
Hannah