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Buy hood which exhausts the air outdoors. Not the ones which just recirculate filtered air. This filters get choked up with the Indian style of cooking and loose efficiency in short time (unless you replace them frequently ). So they just recirculate semi filtered air which is not good. of course to exhaust the air out you should have the necessary ducting in place.

IMO, the over the range ovens are no good for our ( Indian ) style of cooking. They save space but are useless when it come to filtering the air.

Check this http://www.rangehoodsource.com/range-hood-types/