The two most common categories of gas-fired furnaces are: A) ...

[mikaylakyoung]

The two most common categories of gas-fired furnaces are:
 
  A) Category I and Category IV. B) Category II and Category III.
  C) Category I and Category II. D) Category III and Category IV.

Question 2

The two basic types of fans used in most air-handling units are:
 
  A) Centrifugal and axial.
  B) Positive pressure and negative pressure.
  C) Reciprocating and orbital.
  D) Clockwise rotating and counterclockwise rotating.

[maaaaaaaaaa]

Answer to Question 1

A

Answer to Question 2

A

[mikaylakyoung]

Thanks for the timely response, appreciate it

[upturnedfurball]

YES! Correct, THANKS for helping me on my review