Produced using a combination mold tool that combines the hydroforming process and plastic injection-molding of HFH (hydroformed hybrid) components.

PM2.5 removal efficiency: 95% (@2.5µm, 240m³/h)

Toyota Boshoku adopted a dual layer melt blown contruction method in which a fine fiber layer and a coarse fiber layer are producted consecutively on the same production line before being attached by molten plastic.