Arm & Hammer Lift Away HEPA-Filter: * As dirty air passes through filter, Arm & Hammer baking soda particles neutralize odor-bearing chemicals * Made to fit Shark Lift-Away bagless NV221, NV350-NV355 and NV355 E Series and Uprights, including Navigator, Lift-Away and Navigator Lift-Away Pro units * Dimensions: 3.88"L x 5.31"W x 1.94"H * Model# 67490-2