Huh? Voltage doesn't have anything to do with what is being discussed in this particular topic.
"Short-circuit" in this case, refers to blowing the make-up air right inside the canopy of the grease hood, sometimes the plenum or supply is inches away from the baffled filters.
The route of the...
Captive Aire (and others I presume) have done studies and lab tests pinpointing the ideal location for make-up air to a Type I hood. One of the best methods so far, is with a supply plenum attached to front of the hood. This allows make-up air (usually ~80% of exhaust)to be supplied at the hood...
