Aluminum Range Hood Filter with Light Lens - 11" X 11-11/32" X 3/8" (Includes light lens that is approximately 3-3/4" on 11" side)Attributes: Contains an aluminum foil pad between two pieces of expanded aluminum with a light diffusing lens. Usage: This washable aluminum filter with a built-in light diffuser is used in ducted and ductless range hoods. Maintenance: We recommend that the filter be washed 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.