轻便的板式结构，优质的聚酯合成纤维过滤材料，初阻力低，防火性好。
The light panel structure, the high quality PET synthetic fiber filter material is with features of low initial pressure, good fire-proof function.
滤料的初阻力决定于滤料本身的透气度，而运行中的阻力则比初阻力大许多倍。
The initial resistance of the filter medium decides the air permeability of the filter medium itself, but the resistance during operating is several times to the initial resistance.
研究表明，采空区矸石弹性模数、支架刚度及初阻力是影响顶板动态的主要因素。
The study indicates that elastic modulus of the fallen rock in the goaf, the rigidity and setting load of support are the major factors that affect roof behaviour.
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