ComileatTM mini-pleat filter made of high-strength waterproof glass-fiber papers, employs innovative none-separator technology guaranteeing remarkable characteristics of large effective filtration area with low pressure drop,long useful life-time and small installation space. Features. *Frame: PP or ABS plastic material with high burst resistance to air-flow lashing,suitable for HVAC system with frequent vibration in velocity and pressure. *Medium: high-strength waterproof glass-fiber papers without producing poisonous gas when incinerating, meeting requirements of environmental protection. *Spacing material:hot-melt glue.