We have a patio villa and looked into exterior kitchen venting. We called the architectural review office and were told if we vented thru the roof, no approval needed. If we vented thru the wall, approval needed. We decided to get an estimate first and the only company we could find to do this was Doc's Restorations. They quoted us $900 to vent thru the wall. No idea what they might charge now. But we decided against it. This is only one of several money-saving corners cut in TV construction. Good luck.
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