Replacement aluminum filter made by Filter Everything and compatible with Maycor RHF0303. Dimensions measure 3-1/2 x 13-3/8 x 1/8. Sold as a 1-Pack. Our filters are manuctured to meet or exceed OEM quality and are fully compatible with the name brand (OEM) model. Aluminum filters should be cleaned every 60-90 days; carbon filters should be replaced every 6-9 months. Proudly packed and shipped from our facility near Cleveland, OH.