How difficult is it to install a down-draft gas stove?

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I live in a 1927-built house, w/original cabs. When we did the kitchen over about 10 yrs ago, we installed an over-the-stove microwave w/fan. Mistake! Fan wasn't powerful enough, and the grease spread all over my kitchen, the smell permeated INSIDE the cabs.
Changed to a fan, effective but very noisy. Hence, the down draft stove?????
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