MERV 13 Filters
Are all MERV 13 rated filters the same? Are they really all rated MERV 13 or is there fudging going on in this space?
Visually, the filters all appear different – some have cardboard grids on one side to prevent the filter from collapsing into the airflow, some have metal grids, some have cardboard grids on both sides. Which is better/worse for HVAC operation and the environment? Are they all equally sealed at the edge where the filter media meets the cardboard frame?
I learned about flanged filters on this site a while back, but the only ones available seem to be the 4″ deep that fit into a 1″ frame. Given the warning by Allison Bailes in this article: https://www.greenbuildingadvisor.com/article/designing-return-filter-grille-boxes
I’m concerned a 4″ deep would be too restrictive to airflow, but I’d love to try a 2″ deep filter. Do they make 2″ deep flanged filters for install into a 1″ deep frame?
Not knowing the answers to the above, I have generally been ordering 1″ deep MERV 13 filters made in the US, from any company (other than the ubiquitous delivery company) generally based on price alone. This made me think that IF there were a company whose filter quality was vetted by this site, and their price was reasonable, I’d probably just buy those…could be a potential source of revenue…
As far as install, per the photos from Allison Bailes articles, I’ve been taping the filters in to prevent bypass. Wish there was a quicker solution…
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