PVC drain lines on rooftop units should be insulated :

PVC drain lines on rooftop units should be insulated
 
  A) to prevent deterioration of the PVC from exposure to UV
  B) improve system efficiency
  C) to avoid heating the condensate water
  D) to reduce the sound created by the high velocity through the drain

 Q. 2

Where should the vapor barrier be placed when insulating walls?
 
  A) towards the outer wall B) about halfway between the inner and outer wall
  C) outer walls should not use a vapor barrier D) towards the inside wall

 Q. 3

Fire dampers are typically required
 
  A) in the chimney of all residential fireplaces
  B) in all residential buildings
  C) in all buildings that have ductwork
  D) in all commercial buildings with ductwork passing through firewalls