We are doing kitchen reno and managing the project ourselves. We hired hvac company and installed hard duct to the hood position. We are ordering cabinet hood to fit specifically to the ventahood insert. Now ordering the insert itself from appliance dealer…. Question is who I should rely on for installing the insert? Will it be the cabinet installer, hvac company ,or the appliance store? What is the best way to connect low voltage transformer for makeup air unit to the ventahood insert?