1) ceiling filter SP,JE,3A, PE 2) available in roll and customized ... different size of particles in different density level,make the filter can hold more particles and more effective2.Full glued,the ... .served in roll or piece, Can add frame to make filter screen TypeFilterClassAverageArrestanceInitial EfficiencyNominalVelocity(m/s)RatedAirflow(m3/h)InitialResistance(Pa ...