First off, what is a “hood” or “exhaust hood” anyway? The basic concept of a hood system is to capture evaportated substances such as: gas, grease, steam, smoke, smell, etc. It essentialy filters out some of the contaminants and exhausts all of the evaporated substances into the atmosphere, releasing it from being inside the building and possibly causing a fire hazard and harm to the people that are within. These are required on all projects that have gas equipment and a certain type of hood for simple steam only exhaust (slightly less expensive).

Have you ever considered the complexities of Local Mechanical Code requirements for exhaust hoods? City codes? What if something happens?