NO! DO NOT CONNECT TO EXISTING VENTILATION OR DUCTING.

In some cases, this is a hazardous situation. In addition, a spark could pass through the laser's exhaust fan and ignite any dust or particles that have settled in the existing ducting. Gases from sewage pipes, soot from chimneys, fuel accumulations in exhaust systems, and more could also be released. Ensure that ALL laser exhausts remain independent of other exhausts and dust extraction systems.