hbiss
EC, New York NEC: 2017
- Location
- Little Falls, New York NEC: 2017
- Occupation
- EC
My observation is the exhaust hood and ducting will get grease build up and that if you would have a fire make it's way into the duct, you are probably better off having the fan running - will sort of keep the fire contained to the duct, as it would act more like the burner on a large boiler or other industrial burner with air flowing over the burner. Stop the fan and it heats up the duct and anything around it.
There is usually a nozzle or two within or at the bottom of the exhaust duct. Keeping the exhaust fan on will draw the foam mist up into the fan and upper ductwork helping to suppress any grease fire within.
-Hal