Replacement carbon filter made by Filter Everything and compatible with Trion Air Cleaner HE1400 TRIM-Tx. Dimensions measure 12-1/2 x 16 x 3/8 inches. Sold as a 2-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.