The key specifications of the Catridge, After Filter For 20/35 CFM are — CFM: 20/35 Polyproplene Media; Dimensions: Ø60x90mm(L). These specifications are based on the standard GEM Equipments design; always verify against your machine's requirement before use. GEM Equipments Pvt. Ltd. is an ISO 9001:2015 certified, India-based manufacturer (since 1984) of compressed air dryers, cooling towers, industrial chillers, and compressed air treatment accessories, headquartered in Coimbatore, Tamil Nadu.