If combustion air openings pass through horizontal ducts with 4,000 BTU input, how large should the openings measure?
A) 3 inches squared B) 1 inch squared C) 4 inches squared D) 2 inches squared
A
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Small wound rotor motors are often controlled manually by a three-pole make-before-break rotary switch.
Answer the following statement true (T) or false (F)
The bevel on the end of the pipe can be machine cut using a portable pipe beveling machine, or a(n) ____.
A. oxyfuel torch B. handheld torch C. automated torch D. oxyacetylene torch
The fire source for a fire pit can utilize which of the following fuel sources?
a. wood b. natural gas c. propane d. any of the above
When a zone thermostat fan control switch is moved from Auto to On, what should happen?
a. All system dampers open and the blower starts. b. The zone damper for each zone set to On opens and the blower starts. c. The zone damper for that zone closes, all the others open, and the blower starts. d. The zone damper remains open at all times, regardless of the system operating conditions.