3M's basic Filtrete filter. The MERV 8 efficiency is better than an average pleated filter, but not as good as Filtrete's Micro Allergen or Ultra Allergen models. The Model 600 utilizes a "pinch pleat" design, which does not have the rigid and more costly frame cross members that are standard on 3M's higher-end models. The "pinch pleat" design saves you money. Please note that these Filtrete filte
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