Why should an air vent never be put on a closed-type expansion tank?
A) The expansion tank is usually not located in a serviceable location.
B) A closed expansion tank requires an air head to work properly.
C) The large amount of air in the expansion tank would overload the air vent.
D) Closed-type expansion tanks are normally installed at a low point in the system.
B
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¿Cuál de los siguientes materiales de revestimiento es la barrera impermeable más usada sobre el aislamiento de tuberías para las aplicaciones al aire libre?
a. Plástico b. Acero c. Aluminio d. Laminar
____________________ are smooth metal rings that do not have friction material on them.
Fill in the blank(s) with the appropriate word(s).
The top of an extension ladder:
A) At least 12 inches above the point where it rests on the building. B) At least 12 inches below the point where it rests on the building. C) Flush with the edge of the roof. D) Should extend at least 36 inches above the point where it rests on the building.
After raising a wall panel for a platform frame, the panel should first be fastened to the _____
a. top plate b. foundation c. ceiling joist d. subfloor