1) If you are never going to rent the premises out again to restaurant or like business, I cannot see that there is anything against to let your tenant remove the kitchen suction unit. Normally — and I presume it is the same in Thailand, as it normally looks like it is — business rentals are so that the tenant can rebuilt and decorate the rented area to fit business, as long as it's in term with law and regulations. There might special clauses in a rental agreement, including one about to restore the rented back to formed stand when rental ends; it depends on the individual contracts. A deposit could be part of such an agreement. 2) If the registered directors of the company limited lives in same city, they should in my opinion be the ones signing the rental agreement. You can check Thai company registrations online. For free you can see company status (active/defunct), registration date, registered capital, addresses, director names, and submitted annual accounts. You can search using company's name — best to use Thai translation, if it's an English name — or the 13-digit registration number. If they hesitate to give the ID-number to you, it's a classic red flag. The search can be done here: https://www.dbd.go.th/en/hotService/online_service However, you should have a lawyer with experience in business rental agreements to advise you.
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