Industry Insights & Technical Resources

In clean room, pharmaceutical, semiconductor, hospital and industrial HVAC systems, whether HEPA filters need to be replaced cannot just depend on the time of use. Engineers should also check filter differential pressure, actual air volume, integrity test results and contamination risks. The initial resistance determines the fan load when the new filter is put into operation, and the final resistance is the upper limit of pressure loss that the system allows the filter to continue operating. Unreasonable settings of these two parameters may result in insufficient air volume, increased energy consumption, and even affect cleanliness and production safety.

When purchasing HEPA filters, you should not only focus on the H13/H14 grade, filtration efficiency, rated air volume and initial resistance. You should also check the integrity of the filter material, frame, sealant and installation interface. Even if the efficiency of the filter material reaches the standard, local damage or bypass leakage may still affect the cleaning effect. Therefore, high cleanliness projects such as pharmaceuticals, hospitals, laboratories and semiconductors usually require DOP/PAO leak detection tests to verify the sealing reliability of the entire filter.

In pharmaceutical clean rooms, semiconductor factories, hospitals, laboratories and industrial clean environments, even if the HEPA filter reaches the H13 or H14 level, if there is a poor seal between the filter and the mounting frame, unfiltered air may still leak from the frame. Two common sealing methods in engineering procurement are Gasket Seal (gasket seal) and Gel Seal (liquid tank seal). Both can achieve reliable sealing, but there are obvious differences in installation structure, sealing principle, leak detection requirements, maintenance methods and procurement costs.

Industrial ventilation, commercial HVAC, laboratories and clean environments often use plate, V-shaped or granular activated carbon filters when dealing with VOCs and odors. The difference between the three is not only the appearance, but also the form of activated carbon, filling volume, gas contact time, rated air volume, initial resistance and adsorption capacity. Wrong selection may result in poor odor removal, rapid saturation of activated carbon, excessive system resistance, or increased replacement costs. Therefore, project procurement should first determine the type and concentration of pollutants and then select the filter structure.

In industrial ventilation, commercial buildings, laboratories, hospitals and clean environments, activated carbon filters are mainly used to absorb VOCs, odors and some harmful gases. Many buyers only provide size or air volume and request a quote. However, for filters of the same size, the purification effect and lifespan may vary greatly due to different carbon types, filling amounts, contact times and usage environments. For correct selection, you should first clarify "what gases need to be removed", and then determine the concentration, air volume, resistance and replacement cycle.

How to Choose the Right HVAC Airflow Control Equipment? The selection of HVAC airflow control equipment should be based on airflow requirements, pressure variations, control accuracy, and application conditions. Volume Control Damper is suitable for basic airflow adjustment, CAV is used for stable airflow control, VAV focuses on energy-saving and dynamic regulation, while Venturi Valve is ideal for laboratories, cleanrooms, and high-safety environments.

In clean rooms, pharmaceuticals, semiconductors, hospitals and biosafety laboratories, HEPA filters are an important component to control air particles and ensure cleanliness. Although both mini pleated HEPA and partition HEPA can reach H13 or H14 level, their structures are different, which will affect the air volume, initial resistance, fan energy consumption, service life and installation conditions. Don’t just compare filtration efficiency or price when purchasing.

In air handling units (AHU), commercial HVAC, industrial ventilation and clean room air conditioning systems, bag filters and V-type filters can be used for medium-to-high efficiency particulate matter filtration. There is no absolute advantage or disadvantage between the two. When selecting, filtration efficiency, rated air volume, initial resistance, effective filtration area, dust holding capacity, installation space, service life and full life cycle cost should be comprehensively considered.