When installing an oil fired furnace in a confined space with a ...

[Capo]

When installing an oil fired furnace in a confined space with a firing rate of 100,000 Btuh, what is the minimum free air opening required if the combustion air vents are directly communicating with the outside?
 
  A) 100,000 / 2,000 = 50 square inches for each grille
  B) 100,000 / 5,000 = 20 square inches for each grille
  C) 100,000 / 1,000 = 100 square inches for each grille
  D) 100,000 / 4,000 = 25 square inches for each grille

Question 2

If combustion air openings pass through horizontal ducts with 4,000 BTU input, how large should the openings measure?
 
  A) 3 inches squared B) 1 inch squared C) 4 inches squared D) 2 inches squared

[macagn]

Answer to Question 1

B

Answer to Question 2

A

[Capo]

Thank you!

[macagn]

Always glad to help...