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HVAC Glossary

HVAC Glossary Activated carbon — granular processed carbon, commonly used in air filter media to clean the air. Air conditioner — equipment used to control indoor air temperature, relative humidity, purity, and movement. Air conditioning — making indoor air more comfortable by transferring heat and humidity to the outside air. Air-cooled — using a fan to move heat away from the condenser coil to the outside air. Air filter— in heating and air conditioning, the media, element, or device used to remove unwanted particles, vapors, or odors from [...]

Clean Room Classification and Filter Grade

Clean Room Classification Correlation between particle size efficiency, Eurovent 4/5,EN779 and ASHRAE 52.1 and 52.2 Ratings Eurovent 4/5 EU3 EU4 EU5 EU6 EU7 EU8 EU9 EN 779 G3 G4 F5 F6 F7 F8 F9 Arrestance 60 to 80% 80 to 90% 90 to 95% 95 to 98% >98% >98% >98% Dust spot efficiency < 20% 20 to 35% 40 to 55% 60 to 80% 80 to 90% 90 to 95% >95% MERV 5,6 7,8 9,10 11,12 13 14 15 % Min. PSE @ 10 micron 90 98 100 100 100 100 100 % Min. PSE @ 5 micron 75 80 95 98 100 100 100 % Min. PSE @ 3 micron NA NA 85 90 95 98 100 % Min. PSE @ 1 micron NA NA 55 70 85 90 95 % Min. PSE @ 0.5 micron NA NA 35 50 65 75 85 % Min. PSE @ 0.3 micron NA NA 20 40 50 60 70 Rating Comparison for HEPA and ULPA Filters EN 1822 FILTER CLASS % MPPS EFFICIENCY EFFICIENCY [...]

When to Change Filters of Air Handling Unit

When to Change Filters of Air Handling Unit An air handling unit, is a system used to circulate and condition the air in your heating, ventilating and air conditioning unit. Check and replace air-handling unit (AHU) filters regularly to ensure proper function and maximize system operation. Keeping filters and coils clean can dramatically improve the efficiency of the entire HVAC system. Damage of polluted filters Pollutedfilters can increase the energy demand on fans. Pollutedfilters can reduce the volume of supply air, resulting improper [...]

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