Foldable pre-filter (primary filtration)
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Foldable Pre-filter (Primary Filtration)
（1）Product Basic Features:
1. Structure and Material: The outer frame is generally made of moisture-proof cardboard, aluminum alloy, or stainless steel, making it resistant to deformation. The filter media is mostly made of folded synthetic fiber/non-woven fabric, with an external metal mesh for support. The folded structure effectively increases the filtration area, improving dust holding capacity and filtration accuracy.
2. Common Applications: As the first pre-filter in air purification and central air conditioning/fresh air systems, it primarily filters large particles of dust, hair, and other impurities from the air, while protecting the more expensive medium-efficiency and high-efficiency filters downstream. It can also be used for dust prevention in electrical cabinets and computer rooms.
（2）Replacement Cycle Reference：
There is no absolutely uniform replacement standard. Lifespan depends on the usage environment, materials, and maintenance. A general reference is as follows:
Application Scenarios (Ordinary Office Buildings/Shopping Malls):
Recommended Replacement Cycle: 2-3 months
Application Scenarios (Hospitals/Pharmaceutical Factories/Electronic Cleanrooms):
Recommended Replacement Cycle: 1 month
（3）Replacement Judgment Criteria:
* When the filter resistance reaches 2-3 times the initial resistance (initial resistance is usually 50-150 Pa; replacement is recommended if it exceeds 250 Pa).
* If it is made of disposable non-woven fabric, backflushing is not recommended, as the filtration efficiency will decrease by more than 50% after the fiber structure is damaged. For washable nylon/metal mesh models, replacement is also recommended after 2-3 washes.
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Nanmar is an industry leading high-tech company specialising in air quality optimisation, exhaust gas treatment, air filtration and purification related equipment manufacturing and services. At present, we have large production bases in Suzhou and Chongqing.
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