10x10x1 EZ-Pleat MERV 8 Air Filters (6-Pack)
This isn't the average pleated filter you would find at most retail stores. The EZ-Pleat line is made to commercial quality standards. Efficiency is rated at MERV 8 and the EZ-Pleat has 16 pleats per foot giving you much more filter surface area than a flat panel filter (and more than most standard pleated filters). The filter frame is made of moisture resistant beverage board and is die-cut on both sides (not a pinch pleat or one sided frame like the cheap box store brands). This is the kind of design that HVAC professionals know will stand up to even harsh conditions.  This EZ-Pleat is available in all the popular sizes and then some. Rated UL Class II.