The outer frame of the primary filter is made of a strong waterproof plate, which is used to secure the folded filter material. The diagonal design of the outer frame provides a large filter area and allows the inner filter material to adhere tightly to the outer frame. All the sides of the primary filter are glued to the outer frame with special professional adhesive glue, which can prevent air leakage or damage caused by wind resistance pressure.
The outer frame of disposable paper box filter is generally divided into general cardboard box and high strength die-cut cardboard. The filter element is pleated fiber filter material lined with single-side metal screen. Beautiful appearance. The construction is strong and durable. General cardboard frame for the manufacture of non - standard specifications of filters, can be used in the production of any specifications of filters, high strength, not easy to deformation. High strength die-cutting cardboard used in the manufacture of standard specifications of filters, characterized by high precision specifications, low aesthetic cost. If the imported surface fiber or synthetic fiber filter material is used, its various performance indexes can reach or exceed the imported filter.
Filter material is folded into the form of high strength die-cutting cardboard, windward area increased. The dust particles in the incoming air are effectively trapped between the folds by the filter material. Clean air flows evenly from the other side, so the flow through the filter is gentle and uniform. Depending on the filter material, the particle size it blocks varies from 0.5 to 5 meters, so does the filtration efficiency.
