This is a 6-pack filter deluxe filter set designed to fit 500/600 Series Blueair Air Purifiers by Crucial Air. These filters are deluxe as they come with Built-In Odor Neutralizing Particle Pre-Filters in each filter and are a must for allergy sufferers! These filters fits Blueair models 501, 503, 550E, 601, 603, 650E models and ALL Blueair 500 & 600 Series Air Purifiers. The filter dimensions are : 10 x 14 x 9 inches. Designed & Engineered by Crucial Air. This is not a Blueair? OEM product and is not covered under any Whirlpool? manufacturer's warranty. The Blueair ? brand names and logos are the registered trademarks of their respective owners. Purchase of this product voids your Blueair ? warranty. Any use of the Blueair ? brand name or model designation for this product is made solely for purposes of demonstrating compatibility.