Your KD should be coordinating this. All has to be designed to fit and function correctly. It has complex multiple moving parts, including the high skill level needed by your installer, the size of the duct, and the right electrical outlet placement. Start at the beginning. You need a 36” hood, first of all. It needs to be a minimum of 30” above the cooking zone. You’ll need +-600CFM. Plus a Make Up Air system.

Find a better team than a bad cabinet seller and a clueless GC.