AC Repair | What are MERV ratings?
Whenever we want to construct a new home, we conduct a lot of research. Now that you have your home built, you commence doing regular HVAC system ac repair maintenance. In the process, we face something by the name MERV filters. Here is what we need to know about MERV ratings and their meaning.
What is MERV?
MERV (Minimum Efficiency Reporting Value) defines the effectiveness of your filter. These ratings range between 1-16. If a filter is rated highly, it means it has a higher capability to keep away contaminants and dust from getting into the system. The ASHRAE (American Society of Refrigeration, Heating, and Air-Conditioning Engineers) designed the scale for MERV to represent the worst possible performance for a filter at keeping away air particles that are three to 10 microns in size so you can avoid ac repairs.
Some of the particles such filters were subjected to testing are carpet fibers, textile, dust mites, and pollen. Most systems in the residential ac repair environment can remove airborne dust and contaminants with filters that are MERV-rated 7-12. Surgery ratings and hospital filters are MERV-rated 13-16.
Higher is Not Better
While you may think that it is better to have higher MERV ratings, it does not always offer the best utility. The higher the rating, the harder the flow of air through the filter. This creates more resistance to air flow than is designed by HVAC system to manage this creates a loss of efficiency. If you reduce the air flow in the home setup, the air quality will be drastically affected. For this reason, it is important to conduct some ac repair research. Find the highly-rated MERV filter and how fast it can allow air to pass through.
Change Filters Often
Filters that are highly-rated in MERV should be changed more often to avoid inefficiency caused by restricted flow of air and costly ac repairs.