Author Question: If combustion air openings pass through vertical ducts with 4,000 BTU input, how large should the ... (Read 55 times)

MGLQZ · **on:** Jul 24, 2018

If combustion air openings pass through vertical ducts with 4,000 BTU input, how large should the openings measure?

A) 3 sq in B) 2 sq in C) 4 sq in D) 1 sq in

Question 2

A ________ duct system uses several large ducts leaving the main plenum that branch off into smaller ducts as they get closer to their destination.

A) closed loop system B) central plenum system
C) reducing radial duct system D) perimeter loop system