Jackson Systems is now stocking duct mounted CO sensors. The new SL-701 detector samples the air stream at the AHU supply or return. In the event dangerous levels of CO are detected, the SL-701 will shut down the AHU to prevent the spread of harmful gas to the occupied space. The SL-701 CO detector wires similar to the duct mounted smoke detector commercial HVAC contractors are familiar with.
The SL-701 comes as a kit containing everything you need for installation;
Duct mounted Co Detector
Remote accessory with audible and LED alarm indications
Mounting template and hardware