Typically every 3 to 6 months, depending on dust loading, running hours and airflow. The practical trigger is differential pressure across the filter: replace when resistance reaches roughly twice the initial value, or the final resistance specified for the equipment. High dust-load industrial environments shorten the interval considerably, while cleanliness-critical facilities should set the interval from periodic measurement.

Yes. Dimensions, filtration class, number of pockets and pocket depth are produced to the customer's equipment and performance requirements, and frames are available in galvanised steel, aluminium sheet or aluminium extrusion. Send us the duct opening dimensions, rated airflow and target filtration class and our sales and technical team will propose a specification. Contact: +86-513-68551589, liyang@rocean.cn.

Liyang manufactures its own meltblown filtration media, covering bag-type air filtration materials, liquid filtration media, and mask filter media — including grades meeting GB 2626 (KN and KP series), US NIOSH (N and P series), YY/T 0969, YY 0469, GB 19083, EN 14683 and ASTM F2100. Contact our technical team for model-level data on basis weight, filtration efficiency and breathing resistance.