The Btu rating is a rating of the _________ (time, wire size, basis for power company charges, or heating capacity)
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Name two type of fan switch.
What is a non direct vented furnace?
What is the first step a service technician should take when systematically troubleshooting a furnace that contains an IFC?
The _________ transfer heat from the hot gas to the air stream to heat the structure.
Flame current in a flame rectification system is measured in ______ unit
The specific gravity of natural gas is:
Describe the function of a draft safeguard switch.
What is meant by a furnace that has a positive pressure venting system?
When a limit switch circuit opens the circuit to the _____ ______.