I had a carrier 58mvc installed with an infinity control. The controller was alarming out for low static pressure. The installer decided to put a sheet metal constraint after the blower to up the static pressure in order to defeat the alarm. The claim was that our duct work was too big to make the controller work properly, thus the low static pressure. Question: Is this standard? Seems like a band-aid which could be detrimental to performance. Any help would be greatly appreciated.