The key specifications of the Catridge After Filter 450-2000 CFM are — Airflow: 450/600 cfm; Dia: ø 90; Height: 400mm. 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.