The masonry walls behind the firebrick and on the sides of the firebrick should be _____ thick to protect the firebox from overheating.
A. 5"
B. 6"
C. 7"
D. 8"
Answer: D
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An R-22 system has a 28-ft lift and a 7 psi pressure drop in the liquid line due to vertical lift. If the liquid leaves the condenser at 244 psi, what is the pressure at the top of the vertical lift?
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