Glasfloss Z-Line Series MR-11: The Glasfloss Z-Line Series MR-11 pleated air filter launches new higher filter performance with low pressure drop for energy efficiency. The Z-Line MR-11 filtration media offers excellent bi-directional strength, and the continuous synthetic fibers resist shedding. Whether used as a primary filter or a pre-filter, the Glasfloss Z-Line MR-11 is ideal in a variety of commercial, industrial and residential applications. The MR-11 is available in most standard and special size face dimensions in 1", 2", 4" and 6" thickness. • MERV 11. • Electrostatically Charged, 100% Synthetic Media. • Heavy-duty, Moisture Resistant Construction. • Galvanized Expanded Metal Backing. • Standard Size 4" and 6". Incorporate Media Separators All filters are made to order – Please allow 1 – 2 weeks for delivery Return Policy – We have a 14 day return policy. Items must be returned in resalable condition, never used. Return shipping is the customer’s responsibility. Please make sure you have ordered the correct size as a 15%restocking fee will apply to items ordered in error.