BUYER BEWARE.....Do not use this Company. The sales Reps believe they know more than the manufacturers. We ordered the filters advised by the manufacturer, our sales rep Brendan, came onsite, measured the units himself verses taking the advice of the manufacturer, sent the wrong size filters, billed us over $900 for the filters, when advise they are in fact the wrong size, this company refused to correct the problem. Our units sue Vertical filters we were forced to install the sent filters horizontally due to the arrogance of their sales rep. DO NOT USE THIS COMPANY.......I will NEVER use them again, I use Dayton Filters, better service, and they listen to the manufacturer!!