The normal oxygen and carbon dioxide percentages in the flue gas ...

[Sportsfan2111]

The normal oxygen and carbon dioxide percentages in the flue gas of a properly operating gas furnace are approximately:
 
  A) 7.5 percent. B) 12 percent. C) 21 percent. D) 10 percent.

Question 2

Typically, on mini-split systems the line set going to the outdoor unit carries ________ pressure, ________ temperature saturated liquid and vapor mix. The line going back to the outdoor unit carries ________ pressure superheated vapor.
 
  A) low, high, high B) low, low, low C) high, high, low D) low, high, low

[jliusyl]

Answer to Question 1

A

Answer to Question 2

B

[Sportsfan2111]

TYSM

[pangili4]

Excellent