I recommend the merv 11 filters, before we used merv 8 and I would wake up in the morning with a throat full of phlegm and a scratchy voice. Really seems like the merv 11 traps more particals. I would buy them again.
I bought a huge supple of filters for my furnace. They are great to have on hand so I don't have to keep remembering to buy them. FilterBuy was just the perfect supplier for me.
The filter came in record time, and fits beautifully - now I just need to sit back and let you keep track of when it needs to be changed!!! thanks connie ...