The American Metal Filter AMRHF0608 Grease Filter contains an aluminum foil pad between (2) pieces of expanded aluminum. Length and width +- 1/16-inch and thickness +- 1/8-inch. This washable aluminum filter is used in ducted range hoods and microwave ovens to help remove grease particulate from the air. Wash the filter as often as required to prevent grease build up and a resultant decrease in air flow. Soak in a solution of hot water and degreaser for 10-20 minutes. Agitate gently to remove loosened grease. A residue of grease on the filter after washing is acceptable as this helps retain grease. Replace approximately every 6-months to improve air circulation and quality. This OEM part replaces Broan 99010159, RF76A, 97007893, S97007893 and Whirlpool 4342002.