The difference between 80 efficiency furnaces and a 90 efficiency ...

[londonang]

The difference between 80 efficiency furnaces and a 90 efficiency furnaces is that 90 efficiency furnaces
 
  A) use more efficient air filters
  B) use more combustion air per 1000 Btu firing rate
  C) have an extra recuperative heat exchanger that condenses water out of the flue gas
  D) burn more gas to increase the heat exchanger temperatures

Question 2

Unbalanced seals have a _____ face loading than balanced seals.
 
  a. lower
  b. higher
  c. lighter
  d. more evenly distributed

[EAN94]

Answer to Question 1

C

Answer to Question 2

b

[londonang]

Excellent

[TheDev123]

Thanks for the timely response, appreciate it