What is the difference between a a 90 furnace with a sealed ...

[danielfitts88]

What is the difference between a a 90 furnace with a sealed combustion system and a typical 90 furnace?
 
  A) sealed combustion units use household vented air for combustion.
  B) sealed combustion units may use PVC pipe for venting material.
  C) sealed combustion units do not produce any combustion products
  D) sealed combustion units require combustion air to be piped in from the outside.

Question 2

Larger welds are always stronger.
 
  Indicate whether the statement is true or false

[coreycathey]

Answer to Question 1

D

Answer to Question 2

FALSE

[danielfitts88]

Thank you!

[coreycathey]

Always glad to help...