I have an old filter register that requires a 13.5" X 29.5 air filter.
I measured it twice. It is NOT 14" X 30". It will NOT hold a 14" X 30"
filter I tried, it falls in. The blower motor cannot handle anything
other than one of those cheap, old fashion fiberglass disposable
filters, it does not have enough force. The filter register has not
been modified, I checked it very carefully. I cannot find a
manufacturer name anywhere on the register, I checked that too. Some
company made it and probably a whole lot of them at some time. My
guess is whichever company made it probably makes filters for it or
knows someone who makes filters for it. The size may be metric since
it corresponds to 75cm X 34cm, but I don't know of any other country
that uses forced air other than the United States or any foreign
manufacturer of air filters for that mater. If you have any idea as to
who might have made such a filter register, please let me know. Thank
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