Jun 27, 2022 UV-C & MERV 8 HVAC Filters Outperform MERV 13 Pathogen Removal Performance
UV-C & MERV 8 HVAC Filters Outperform
MERV 13 Pathogen Removal Performance
To help prevent disease transmission, ASHRAE and the Centers for Disease Control and Prevention recommend upgrading HVAC filter ratings to at least a MERV 13 rating (Minimum Efficiency Reporting Value) .
HVAC manufacturers and facility engineers are quick to caution that not all AHU systems–particularly the large number of aging systems–can handle the high airflow restrictions and static pressure commonly associated with high-efficiency MERV 13.
Adding a high-efficiency HVAC filter can reduce airflow—essentially starving the machine of air like a dirty or fouled air filter. Limiting airflow inhibits heat transfer, forcing HVAC engineers to increase the fan speed or lower chilled water temperatures to compensate, which raises energy consumption.
Fortunately, there is an easy-to-implement alternative for the millions of HVAC systems that were never intended to perform with MERV 13+ filters.
Through a layered approach, facility engineers can combine medium-efficiency filters (MERV 8) with ultraviolet germicidal irradiation (UVGI or shortwave energy in the ultraviolet C spectrum) to meet or exceed MERV 13 level efficiency rates without sacrificing airflow or compromising cooling capacity.
In other words, thousands of building managers can comply with federal indoor air quality recommendations without limiting airflow and obstructing HVAC system operation.
Third-party, independent testing has shown that combining UV C together with a MERV 8 prefilter exceeded a 99% average single-pass reduction of the aerosolized SARS CoV 2 virus. This exceeds the removal rate of the MERV 13 filter that health agencies and industry advocates recommend.
Moreover, the low-pressure drop associated with the MERV 8 air filter significantly reduces fan horsepower (e.g., saves HVAC energy consumption) and maintenance costs.