• Adopting non-woven cloth and glass fiber as filtering materials, primary-efficiency filter chooses pleated wedge shape to enlarge the actual effective filter area.
• It is designed as plank structure supported by metal mesh clip or inner joints frame together with metal outer frame.
• So it features low resistance, long endurance, washable, economical and practical. 

Application:

• Primary-efficiency filter is fit to pre-filtering for central air-conditioning ventilation system, combustion gas turbine and air compressor.

Structure:

• Primary-efficiency air filter is designed for two kinds of structures-joint frame and general framework.
• The former is strong, even filtering material, but time-consuming in manufacturing whereas the latter is easy to change filtering material, time-saving but not as strong as the former.

Filtering material:

• Activated carbon filter adopts washable non-woven cloth, activated carbon, synthetic fiber, chemical fiber (imported), glass fiber (imported), Kam-convex mesh (nylon net).
• Non-woven cloth and glass fiber are more widely used with primary or medium efficiency.