It depends on the product. Below is a list of locations
The name plate mounted on the outside of the panels down to the ground or on top of the control cabinet, inside the housing. Remove the service door to read the sign.
Directly inside the service hatch.
On the outside of the middle section.
Bath & Massage Bath
On the inside of the bracket to the pump or written with ink on the outside of the bath. Demount the front to view the data.