Wall heater advise needed pls

Hi everyone need advise on how to inspect this unit. Im not familiar.
Obviously dated and not common , how would you report on this?
Vent clearance?

What is the vent for? Is it single wall or double wall?

Looks like a recessed direct-vent gas wall heater unit. You need its installation manual to look up the specs.

It is impossible to provide any accurate advice to you without a model number.

Not looking for 100 percent accurate detail info. Just want some experience input to prepare. In inspecting this next week. Just trying to prepare as I never see this type of unit.

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Post what it is when you inspect. Looks like a category one appliance with B vent piping from here.

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