HUBER air filter plants are able to achieve separation efficiencies in excess of 99.95%
In some water chambers condensation drops occur on the ceiling and walls. This should generally be prevented through sufficient insulation of the ceiling, sloping ceilings or through special coatings. Frequently, however, the problem cannot be solved with static methods.
In 2011 already, we published a report about our experience with retrofitting forced ventilation systems in the elevated reservoir Utzenaich in Austria. When the reservoir with two rectangular chambers with 250 m³ capacity each was built in 2007 it had to meet high hygiene standards. The equipment components included stainless steel lining, sloping ceiling and air supply line with integrated air filter and underground loop with a slope to the air cooling and condensate discharge.
HUBER air filter plants type L251 to L662 filter the air with a class H13 HEPA filter (HEPA = High Efficiency Particulate Filter or filter for suspended matter). According to DIN 1822:2011 filter class H13 means a separation degree (integrated measurand) of > 99.95 %. This is standard for operating rooms.
The types L361 to L662 have a class M5 fine filter as pre-filter in addition to the H13 HEPA filter (according to EN 779:2012). Note: A water chamber with air supply via a HUBER air filter plant 'breathes' air as pure as in operating rooms of hospitals.
But: There are people working in an operating room who breathe in and out producing used air. Therefore, routing of supply air and exhaust air flows is provided for in these rooms.
We followed the example of such rooms and adapted this solution as far as necessary. Similar to the people working in operating rooms the water surface gives off humidity to the air. What is needed in the water chamber if it comes to condensation, in addition to the air filter plant, is forced ventilation (via ventilators) and exhaust air routing.