National Board 'NB'
The National Board 'NB' stamp enables EXHEAT to file a manufacturer's data report for each heater and pressure vessel with the National Board of Boiler and Pressure Vessel Inspectors in Columbus, Ohio.
The National Board 'NB' stamp enables EXHEAT to file a manufacturer's data report for each heater and pressure vessel with the National Board of Boiler and Pressure Vessel Inspectors in Columbus, Ohio.