MICROSHIELD

The zero-bypass design in MICROSHIELD filters refers to a construction method that seals the filter media to the frame, preventing unfiltered air from passing around the edges. This ensures that all air entering the filter passes through the media, maintaining the rated MERV 15 efficiency. In standard filters, bypass can reduce effective filtration by 10–30%, allowing contaminants to enter downstream components. MICROSHIELD's design uses a continuous seal or gasket integrated into the frame, which is particularly important in applications requiring strict particulate control, such as cleanrooms or hospital isolation rooms.

MICROSHIELD offers filters with plastic frames (typically polystyrene or polypropylene) and chip board frames. Plastic frames provide higher moisture resistance and dimensional stability in humid environments, making them suitable for coastal or high-humidity installations. Chip board frames are more economical and are often used in dry, indoor applications where moisture exposure is minimal. Both frame types are available in the same MERV 15 efficiency and zero-bypass construction. The choice depends on the environmental conditions of the installation site and budget considerations.

The service life of a MICROSHIELD MERV 15 minipleat filter depends on the particulate loading in the airstream and the system's airflow rate. In typical commercial HVAC applications with moderate dust loads, these filters can last 6 to 12 months before reaching the recommended final pressure drop of 1.0 to 1.5 inches w.g. The minipleat design increases media surface area, which extends life compared to standard pleated filters of the same depth. Regular monitoring of differential pressure across the filter is recommended to determine replacement timing.

MICROSHIELD filters with synthetic media and plastic frames are generally rated for continuous operation up to 150°F (65°C). For higher temperature applications, such as those near ovens or boilers, filters with metal frames and glass fiber media are typically required. The chip board frame models have a lower temperature limit, usually around 100°F (38°C), due to the adhesive and material composition. Always verify the specific temperature rating of the filter model against the operating conditions of the air handling system.

The initial pressure drop of a MICROSHIELD MERV 15 minipleat filter at the rated airflow (typically 500 fpm face velocity) is approximately 0.35 to 0.50 inches w.g. for a 4-inch deep filter, and 0.50 to 0.70 inches w.g. for a 2-inch deep filter. These values are based on the synthetic media's low resistance characteristics. As the filter loads with particles, the pressure drop increases. The manufacturer recommends replacing the filter when the pressure drop reaches 1.0 to 1.5 inches w.g. to maintain system efficiency and avoid excessive energy consumption.

Yes — 3G Electric (S) Pte. Ltd. supplies MICROSHIELD products. We stock the MICROSHIELD catalog and supply genuine factory-original products with full manufacturer warranty and technical support.