Will G4 Plate Air Filter affect airflow volume?
When installed and in service, the G4 Plate Air Filter brings slight airflow volume loss, yet it will not lead to substantial airflow attenuation or ventilation system failure. Its influence on airflow volume falls into three states: brand-new condition, normal operating condition, and clogged aging condition. This is a normal physical phenomenon for ventilation equipment such as central air conditioning and fresh air systems. From the principle of equipment operation, the core function of a filter is to intercept dust and particulate matter in the air. Airflow inevitably generates air resistance, also known as pressure drop, when passing through filter media. Pressure drop serves as the core factor affecting airflow volume. Higher pressure drop results in greater airflow loss, and vice versa.
A brand-new unused G4 Plate Air Filter adopts fluffy synthetic fiber filter media with an open fiber structure, high porosity and excellent air permeability. Its initial pressure drop is only 20–30 Pa, meeting the industry ultra-low resistance standard. Under the system's rated airflow operation, the airflow volume loss of the brand-new filter is less than 5%. This change can hardly be detected by users or equipment. It will not affect indoor air exchange performance or equipment air supply efficiency and fully complies with the airflow design standards for most conventional ventilation systems. Most fresh air and air conditioning systems on the market reserve allowance for pressure drop loss from G4 pre-filters during design. Therefore, installing a brand-new filter will not result in insufficient air volume or weak air supply.
Within the normal service cycle, generally 1 to 3 months, the filter gradually captures suspended dust, hair, flocs and other large particulate impurities in the air. The pores of the filter media become slightly blocked, and pressure drop slowly rises to 40–60 Pa. At this stage, airflow volume loss stabilizes at 8%–12%, which remains within the acceptable operating range of equipment. Airflow attenuation at this stage is uniform and slow and will not affect indoor air circulation, temperature and humidity regulation, or air exchange frequency. It is an inevitable trade-off for air filtration and purification and also the foundation to guarantee air quality.
If the filter is not cleaned or replaced for an extended period, heavy dust accumulation will block pores over large areas. In severe cases, filter media hardening and mildew may occur. Pressure drop can surge above 100 Pa, and airflow volume will drop sharply with losses exceeding 20%. Users can clearly notice weaker air supply at outlets and slower indoor air exchange. Meanwhile, fan load increases, leading to higher power consumption and louder operating noise. In addition, non-standard installation may slightly reduce airflow volume. For instance, mismatched filter dimensions, misalignment during installation and poor sealing cause turbulent airflow and indirectly reduce effective airflow volume.
To avoid substantial airflow loss, operators only need to follow standard maintenance requirements. The filter can be cleaned every 30 to 45 days under normal environments. In heavily polluted environments, inspection and cleaning are required approximately every 20 days. Direct replacement is needed after 3 to 6 months of cumulative operation. Timely maintenance keeps the filter at a low pressure drop state, controls airflow loss within a reasonable range, balances filtration performance and ventilation system operating efficiency, and imposes no negative impact on daily ventilation. Overall, the G4 pre-filter's impact on airflow is controllable and reversible, making it a cost-effective and highly compatible basic filter component for ventilation and purification systems.