Step it proper. A hood must be not less than as broad as your cooking floor, but an added three inches on all sides can enhance efficiency. The deepness must cowl the again heaters and not less than half of the entrance burners, although full safety is greatest. The elevation at which the hood hangs over your cooktop will definitely likewise affect how nicely it features. A wall surface- or island-mount have to must do with 30 inches above the cooktop, whereas undercabinet-mounts, usually a lot much less highly effective and with smaller air ducts, should relaxation 24 inches over the vary. In case you intend to place the hood greater than prompt, you’ll want a broader system– prolonging three inches past either side of the array– in addition to much more cfm to compensate. (See “Calculator,”.