HF Series Compressed Air Filters

One housing, six element grades

The grade digit after HF sets what the bowl removes

The HF Series is a modular inline filter built around one housing family and six push-on element grades. Twenty-two housing sizes run from a 20 SCFM bowl unit on 3/8 in pipe to a 21,250 SCFM ASME vessel on a 10 in flange, so one grade can be carried from a single machine to a central plant. Grade 7 is the 1 micron prefilter ahead of a refrigerated dryer, Grade 5 the 0.01 micron oil-removal afterfilter behind it, Grade 3 the tighter coalescer, Grade 1 the activated-carbon vapor adsorber, Grade 9 a separator and 3 micron coalescer in one bowl, and Grade 6 a dry afterfilter for desiccant dryers.

Housing details that matter at element change. Self-locking quarter-turn head-to-bowl connection; no tie rod and no threads to cross; Push-on elements with piston seals and corrosion-resistant cores seat without tools; Enlarged flow paths in the head keep the clean pressure drop low across the whole size range; Stocked with the D automatic drain, a slide or gauge differential-pressure indicator and the L liquid level window.

Prefilter and afterfilter for every refrigerated dryer. A 250 SCFM dryer takes an HF7-32 prefilter and an HF5-32 afterfilter on 1 in or 1-1/2 in pipe; Wall bracket kits 23.4331-01 (housings 12 to 20) and 23.4331-02 (24 to 48) hang the pair beside the dryer; Replacement elements follow the housing number: E7-32 and E5-32 for the pair above, E5-32S with a stainless core.