List four practices that the technician should follow when installing flexible ducts.
What will be an ideal response?
Cut the flex duct to fit and fully extend.
Keep the flex duct straight.
Use long sweeping bends rather than tight turns.
Support the flex duct along its length.
Avoid kinks and sharp bends.
Use bend braces when turning corners.
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A float switch is used when a pump motor must be started and stopped according to changes in the ____ in a tank or sump.
a. mercury level b. Bourdon c. water pressure d. liquid level
How does certification affect heating equipment in the United States?
A) Only electric heating equipment is required to have testing or certification by an accredited testing agency. B) All heating equipment must be tested, certified, or listed by an accredited testing agency. C) All heating equipment undergoes voluntary testing and certification by accredited testing agencies. D) All gas appliances are exempt from certification but must be tested by an accredited testing agency.
________ is a plant hormone named after a rice fungus that is important in seed germination.
Fill in the blank(s) with the appropriate word(s).
For maximum energy efficiency in a structure, air infiltration is controlled by properly applying and sealing _____.
a. building paper b. polypropylene film c. rigid insulation d. building wrap