PrecisionCell II extended surface minipleat filter offer the end user high efficiency filtration performance in minimal media pack depths of 4" deep in 60 to 65% (MERV 11), 80 to 85% (MERV 13), and 90 to 95% (MERV 14 to 15), and are available in a corrosion resistant metal frame (M) for box style or optional metal frame with a single ¹³/₁₆" header (MSH).