This is a stacked Convotherm C4eT 6.20 GB-N Combi Steamer commercial gas-fired combi oven setup mounted on a stand. Based on the data plate and photos:

Specifications

• Model: C4eT 6.20 GB-N
• Brand: Convotherm / Welbilt
• Type: Gas-fired combi steamer oven
• Configuration: Double stack
• Power:
  • 120V
  • 1 Phase
  • 60Hz
  • 7.5A controls
• Gas:
  • Natural Gas
  • 7" WC / CE (17.4 mbar)
• BTU:
  • Oven: 68,200 BTU/hr
  • Steam generator: 61,400 BTU/hr
• Country of manufacture: Germany