Came out to perform a leak detection test for the customer. Upon arriving the customer explained to me that the other units hasn’t been able to keep up. I checked the airflow and found that all the return air is being pulled directly from the attic. The attic air is extremely warmer than the ambient air in the facility. This is causing the systems to work insufficient and causing stress on the systems. The customer will need to remove all the vented tile and put regular ceiling tile to stop the air from escaping into the attic. The customer will need to build the new plenums and add 5-8” duct runs throughout the clinic.