The Boiler Class 5B Refrigeration Piping Mechanic (CL5B) Contractor License allows you to do the following work:
Login credentials emailed upon enrollment
Unlimited access (no time limits)
Step-by-step solutions to math problems
Below is all the information related to the trade exam, including the official reference list.
This set of books includes all required references for the Boiler Class 5B Refrigeration Piping Mechanic (CL5B) exam. Orders placed before 2 PM are shipped the same day via UPS and a tracking number is emailed before 3 PM.
Books Allowed in Testing
Boiler and Pressure Vessel Code, Section B31.
Boiler and Pressure Vessel Law, Oregon Revise
Oregon Administrative Rules, Chapter 918, Div