Posted: 12/22/2007 11:25:20 AM EDT
My AC/heater filter is 20x20x4, but I can't find them locally (yet), so can I use 4 20x20x1? 
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Order a new one on the internet. Yes you can use a 1" but they don't fit in the housing real well and can tip over easily. ETA - Reread your original post, I missed the fact that you want to stack four 1" filter, that is a no no. Just use one 1" until you can fins the proper 4". |
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Using the 4 stack , 1 inch method is not the same as the orignal 4 inch filter. The 1" filter will still have a flat surface, that will need to be changed out more often than the 4" filter.........has the accordian look to it, more surface to catch dust and dirt. It is better than nothing until you can find the right one though. |