What MERV filter rating is recommended for air purifiers?

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The recommended air filter rating for air purifiers is MERV 13 or 14.

Guidance notes on ventilation and indoor air quality (IAQ) have been issued by the Department of Occupational Safety and Health (DOSH) under the Human Resources Ministry. These notes aim to reduce the risk of airborne transmission of Covid-19. The recommendations include specific details on air filtration systems to enhance air quality in various settings.
Air Filter Efficiency Recommendations

The guidance specifically suggests the use of air filters with a Minimum Efficiency Reporting Value (MERV) of 13 or 14. Alternatively, High Efficiency Particulate Air (HEPA) filters are also recommended. These filtration systems are intended to increase air exchanges within a space, contributing to better indoor air quality.
Broader Ventilation Strategies

Beyond specific filter recommendations, the guidance promotes general measures to improve ventilation and indoor air quality. These include increasing natural ventilation by opening windows or doors whenever possible. Reducing the density of occupants in air-conditioned areas is also advised, alongside the use of fans to supplement air circulation.
Integration with Existing Protocols

The implementation of these ventilation and air purification measures is intended to complement existing Standard Operating Procedures (SOPs) established by the National Security Council (MKN). The aim is to create a multi-layered approach to disease transmission reduction, integrating improved IAQ with other key public health measures.
Development Basis for Guidance

The development of these guidance notes draws upon established frameworks and international standards. They are based on the Industry Code of Practice (ICOP) on Indoor Air Quality 2010, published by DOSH. Additionally, the guidance incorporates information from relevant documents published by international organisations, including the World Health Organisation.

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What MERV filter rating is recommended for air purifiers?

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