For newcomers in HVAC, field maintenance technicians, installing bag-type medium-efficiency filters for the first time can be tricky. Common issues include dust leakage from the unit after installation, filter bags being blown flat by the wind, and inexplicably increased power consumption of the air conditioning system, mostly due to careless installation details. Bag-type medium-efficiency filters are widely used in central air conditioning and purification air cabinets in pharmaceutical factories. Based on years of hands-on installation experience, let's discuss the common mistakes beginners make and practical tips to avoid them.
Frequent mistakes in on-site installation
First, installing the inlet and outlet air incorrectly and placing the filter bags horizontally. Many newcomers overlook the airflow direction arrow on the filter frame and carelessly install the filter bags upside down or flat, causing reverse airflow to compress the filter cloth, significantly reducing the filtration area and quickly increasing the pressure difference after a short operation.
Second, not adding seals to the frame, leading to air leakage from cabinet gaps. If there is no sealing tape applied to the gap between the filter and the groove, dirty air can bypass the filter material, doubling the wear on the downstream high-efficiency filter.
Third, installing without inspecting the goods. Damage during transportation can cause filter bags to have loose seams or holes that are not easily visible. Installing without inspection can lead to dust penetrating and contaminating the entire air duct.
Practical installation tips to avoid pitfalls in two or three areas
Suggestion 1: Install vertically according to the airflow direction and remove the outer packaging film. Install following the arrow indicators, ensuring all filter bags are placed vertically downwards to avoid tilting or laying flat, which guarantees uniform airflow filling each filter bag. The outer plastic protective film must be completely removed; any remaining film wrapped around the filter cloth can cause localized blockage, which is a fundamental point in the installation of medium-efficiency filters for central air conditioning.
Suggestion 2: Apply sealing sponge around the groove to block air leaks. Clean the debris from the air cabinet's groove in advance, and apply sealing tape around the groove. Ensure there are no gaps around the filter after installation; for older cabinets with larger gaps due to deformation, using sealing glue to fill the gaps is a reliable sealing technique for medium-efficiency filters. Mingyang has various specifications of bag-type medium-efficiency filters in stock, along with matching sealing accessories, eliminating the need to improvise materials on-site.
Suggestion 3: Inspect each filter bag upon unboxing, and avoid forceful installation. Check each filter bag for loose seams or damage at the corners; discard any defective products. Assemble multiple filter screens smoothly into the groove without prying or pressing the aluminum frame to avoid deformation. For high air volume units, prioritize F7 and F8 grades, leaving space in the air duct to prevent excessive wind pressure causing the filter bags to stick together.
Simple self-inspection method after completion
After everything is installed, run a test for 30 minutes. Compare the initial pressure difference of the equipment; if the pressure difference is abnormally high, it indicates an installation error. If there is no floating dust at the air outlet and the pressure difference is stable, it means the installation meets the standards.
Conclusion
Standardized installation of bag-type medium-efficiency filters can extend the filter's service life and save energy costs for air conditioning. If you encounter non-standard air cabinets that require customized bag-type medium-efficiency filters, please contact Mingyang for tailored specifications and supporting materials.