What happens first when there is a call-for-heat signal to a ...

[amal]

What happens first when there is a call-for-heat signal to a furnace equipped with a motor-driven vent
  damper?
 
  a. The burners light to warm a bi-metal element.
  b. A switch in the damper closes to start the burner.
  c. A motor opens the vent damper.
  d. The burners light to start the motor.

Question 2

The National Fuel Gas Code category of vent system used with a natural draft furnace is _____.
 
  a. Category I
  b. Category II
  c. Category III
  d. Category IV

[amy.lauersdorf90]

Answer to Question 1

c

Answer to Question 2

a

[amal]

Thanks for the timely response, appreciate it

[juliaf]

TYSM