Why do many building codes restrict the use of unvented gas-fired ...

[ENagel]

Why do many building codes restrict the use of unvented gas-fired space heaters?
 
  A) They heat unevenly.
  B) They tend to be less efficient than vented space heaters.
  C) It is difficult to connect ductwork to them.
  D) They release all their combustion products into the space they are heating.

Question 2

Adding a little extra refrigerant over the amount recommended by the manufacturer:
 
  A) Reduces system capacity but slightly increases system efficiency.
  B) Reduces both system capacity and efficiency.
  C) Increases system capacity slightly but reduces system efficiency.
  D) Does not affect system capacity or efficiency, but provides a buffer against future refrigerant loss and nuisance call backs.

[laurnthompson]

Answer to Question 1

D

Answer to Question 2

B

[ENagel]

TY

[laurnthompson]

You're welcome