HST4 400STC3 element

Open Vented Tanks – HST/4

A Positive, sterile, air flow across open vents

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The Foramaflow HST/4 open vent vessel filtration system is available in three standard sizes with positive flow rates from 100m3/hr to 1000m3/hr.

The system provides for a continuous flow of sterile air across the ullage space of the storage tank delivering a positive pressure of sterile air across the open vent. This system is extensively used in the dairy and water industries.


Stainless Steel

Filter Media:

Hydrophobic Microglass water repellent paper to BS 2823

Operating Temperature:

Upto 120 Deg C for short periods. RH Conditions: 100% RH Environment (no free moisture)

Pressure Integrity:

3 Kpa min. Differential pressure in both flow modes.

TSE Free Manufacture:

The Foramaflow Filter system is completely TSE Free (Transmissible Spongiform Encephalopathy) in accordance with the Food Hygiene, pharmaceutical and the MHRA industry standards, this includes all of our primary packaging.

Flow Rate:

Flow rates from 100m3/hr to 1000m3/hr




Complete range of fittings available from 3 - 8".

Delivers a Positive, sterile air flow across open vents.