1)HEPA filter, Metal mesh pre-filter 2)made of glassfiber paper and alunium ... easy to install High temperature HEPA filter, Metal mesh pre-filterCompared with mini-pleat filter, absolute HEPA filter has larger filtering area, ... diameter)is higher than 99.95%.Normally, this product can be used as end filter of ventilation and filtering ... *220H1311.46800≤220≤600 High temperature HEPA filter, FILTER MEDIA