Unknown odor in the building at Golden Living Center

At 21:12 Station 20 was alerted for a unknown odor in the building at Golden Living Center on Logans Ferry Road. Chief 20 called on scene with a unknown odor in and outside of the building. Rescue 20 called on scene with a crew of six and chief 20 asked crews to report to the front doors with gas monitors. Crews reported to command that they had readings of carbon monoxide in parts of the building. At this time crews from medic 610 and rescue 20 started moving patients to the other side of the building. Crew from engine 20 laddered the front and went to the roof to find the problem.Engine 20 crews found a problem with a roof top heating system and shut down the unit. Director 610 who had ems command called for other medic units to the scene for standby for patient transport. Crews started to vent the area and medics checked all patients. At this time ems command called for units to respond for transport of patients to be checked out at local hospitals And fire crews had vented the area with no readings in the building. A big thanks to all responding ems units that helped with the transports