Poor Indoor Air Quality With MERV-13 Filters
We have two HVAC systems in our MN house that circulate air continuously. Both have MERV-13 filters. Compliments of Canadian wildfires the outdoor air is quite bad. PM2.5 = 50.3 and US AQI = 137. Inside though we are at PM2.5 = 42 and US AQI = 117 which are both quite high.
All windows and doors are closed and ERV’s haven’t run since yesterday so should be minimal outside air coming in unfiltered. MUA for range hood enters downstream of the filter so that air s/b getting filtered.
I’m not sure of the volume of house air filtered is. That would be nice to know.
Even so, I’m surprised at how bad our indoor air quality is. Thoughts?
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