Furnace filter ratings Canada
Furnace filters in Canada are typically rated using the Minimum Efficiency Reporting Value (MERV) system. The MERV rating measures a filter’s ability to capture particles of different sizes from the air that passes through it. The higher the MERV rating, the more effectively the filter removes particles from the air.
The MERV rating scale ranges from 1 to 20, with higher numbers indicating a higher level of filtration. In Canada, most residential furnace filters have a MERV rating between 8 and 16. Here’s a breakdown of what each rating means:
MERV 1-4: These filters capture only the largest particles, such as dust mites, pollen, and carpet fibres.
MERV 5-8: These filters capture smaller particles, such as mould spores, pet dander, and some bacteria.
MERV 9-12: These filters capture smaller particles, such as fine dust, smoke, and viruses.
MERV 13-16: These filters capture small particles, including bacteria, smoke, and odours.
It’s important to note that higher MERV ratings do not necessarily mean better air quality. Filters with higher ratings may restrict airflow in your furnace, leading to reduced efficiency and increased energy costs. Choosing a filter with a MERV rating appropriate for your furnace and your specific air quality needs is recommended.
