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Reference information: Progressive Density Media Structure
PROGAF filter bags utilize an advanced media structure developed specifically to deliver both long life and absolute filtration. Their progressive density design uses up to 12 layers of media which become finer and finer as fluid passes through. The result is a gradual removal of contaminant without any single layer blinding prematurely. http://tinyurl.com/3keuzy5
VariCel V Vee Bank High Efficiency Mini-Pleated Filters
The microglass fiber pleated media features a dual layer, progressive density design for maximum dust holding capacity. http://g3filters.com/vee_bank_filter_page.php
casper Native speaker of: English PRO pts in category: 25