At ~1:07 PM, Westmoreland 911 dispatched Station 20 (Murrysville VFC) to assist Station 22 (Export VFC) for a Carbon Monoxide (CO) Alarm at Duff Manor in Export. Station 20 responded with Engine 20 (3 firefighters) and Rescue 20 (3 firefighters). Westmoreland 911 also dispatched the following additional stations to support Station 22: Station 64 (White Valley VFC), Station 78 (Sardis VFC), and Station 610 (Murrysville Medic One). Engine 20 and Rescue 20 arrived on scene, were put in support positions by Command 22, and their crews went forward to assist in the evacuation of the structure, and further survey of the interior. Once the structure was ventilated and Peoples Gas Technicians arrived on scene, Command 22 released all Station 20 units for return to service and station.