They seem to be good filters, although very expensive. Theres got to be a cheaper alternative. Date box on filter is upside down. Does that mean the airflow arrow could be backwards too? That makes the filter placement very confusing. I dont know if I can trust this filter or company.
I think the filter will be effective. The only issue I saw was the quality of the manufacturing. Some of the panel pleats were not uniformly configured, and I couldn't reposition them without damaging the unit. Some of the pleats were right next to each other, so I assume the sides that were against each other would not be as effective at filtering as they should be. It's just my non-expert opinion of what I would expect in a performance issue with these "problems". Regardless, I still think the filter will do its job because most of the filter looked like I expected...uniformly configured. I think it will be a good filter for the price.
This is my second order. I tried Filtersbuy filters for the first time about 6 months ago. I upgraded from a Merv8 to a merv11 for less than half the price I was paying my havc service group. Filters fit well and I am very happy with the quality of the filters.