In all furnace cabinet configurations, the return air
A) enters at the heat exchanger end and exits the fan housing end of the furnace
B) enters at the fan housing end and exits the heat exchanger end of the furnace
C) and combustion air enter the furnace through the same opening
D) enters as combustion air, travels through the heat exchanger, and exits the fan end of the furnace
B
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Fill in the blank(s) with the appropriate word(s).The P-type or anode end of the diode is the positive end, and the N-type or ____ end of the diode is the negative end.
a. resistor b. neutral c. cathode d. bias
If a walk-in is running at a 50° box temperature, what should the evaporator temperature be?
a. 20° b. 25° c. 30° d. 40°
The most common type of exterior finish is _____
a. vinyl siding b. aluminum siding c. wood siding d. brick siding