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Stacking Two 2" Filters?

Posted: Tue Jun 11, 2019 1:31 am
by Barikalal
I have a 20x25x4 filter box at my furnace. I can't find any filters that size in town. I asked my HVAC technician where to buy this size filter. He said he'd never seen any that size. The thickest he has seen is 2". He suggested stacking two 2" filters together in my filter box? Any thoughts on this??
Thanks a lot.