Hot answers tagged exhaust-fan
The picture of your range hood indicates that it was designed to vent back into the kitchen area if desired. That is what those small louvered vents on the front are for. Most such units can be either vented through ducting in the traditional method (preferred method, IMHO) or vented through the vents on the front of the unit. They are called convertible ...
I used something like this (4 in. Round Wall Vent). It only flaps when the wind is really blowing. Here is another option that should have no clickey clackey at all: Cape style backdraft damper
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