12-8-25 Direct gas-fired warehouse heater located in the center area The unit is also mounted upon the roof Cambridge serial # 200507F1333 This unit was not heating properly. I did find the filters completely plugged up and also the damper control drive motor is bad, not opening the damper to 100% only open it about 25% I picked up new filters and installed. I manually opened the damper to 100% system is working. We will give proposal to replace the damper motor and also pull and clean the burner assembly The west direct fired warehouse heater, which is mounted inside the warehouse with an outside damper and also an inside damper. Access to this unit you have to have a scissor lift. Found the filters completely plugged up and replaced the filters checked the belt. I was having some problems with airflow. I also found the inside damper drive motor. It’s not working. I locked this one in the open position. During testing, I was getting real bad airflow but enough to keep the unit runn