Ventilation Saw : A high-powered saw with metal-cutting teeth or disc for quickly making large openings in roofing materials. Often, a chain saw with an attached guard to limit the depth of cut
Wikipedia, The Free Encyclopedia, Glossary of firefighting equipment, Wikimedia Foundation, http://en.wikipedia.org/wiki/Glossary_of_firefight ing_equipment, CA, USA 2012. (Fr Srvc - Amer) {509}