What type of measurement are furnace filters measured by?

I am asking for my mom, she wants to change the furnace filter but does not know what measurement they are measured by. Is it by inches, feet, cm or meter? thank you everyone. We couldnt find it on the old one. We had to measure it with tape. thanks again guys, i really aprichiate it.

Asked By: Shane Burke - 12/22/2008
Best Answer - Chosen by Asker
Typically filters are measured by inches. For instance a filter may be 20"x25"x1". That's height, width and thickness. Pleated filters provide more surface area for dirt and particulate matter to accumulate on and will do a slightly better job than flat standard types.
Answered By: Chiefmanycrows - 12/22/2008
Additional Answers (4)
In the USA the sizing is mentioned in inches...
Answered By: glen G - 12/22/2008
In the U.S. by inches, usually, it is marked on the old filter.
Answered By: Bub - 12/22/2008
In the USA measured by inches. Length,width & thickness.
Answered By: Sneaky B - 12/22/2008
If you live in the US Shane it is in Inches.
Answered By: johnbenn_2000 - 12/22/2008
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