The key specifications of the Catridge Pre Filter 450 - 2000CFM are — cfm: 250/600; Top & Bottom End cap material: ABS; 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., established in 1984 and ISO 9001:2015 certified, is one of India's leading manufacturers of compressed air dryers, cooling towers, industrial chillers, and compressed air treatment accessories, based in Coimbatore, Tamil Nadu.