Which of the following materials has an the highest R value per ...

[Chelseaamend]

Which of the following materials has an the highest R value per inch of thickness?
 
  A) Rigid foam board B) Spray-on cellulose fiber
  C) Loose-fill fiberglass D) Batt and blanket rock wool

Question 2

When would a fire damper be used?
 
  A) Anywhere rooftop air conditioners are installed
  B) Anytime supply or return ducts must pass through a firewall
  C) If a building is deemed green
  D) In a partition

[bimper21]

Answer to Question 1

A

Answer to Question 2

B

[Chelseaamend]

Thanks for the timely response, appreciate it

[milbourne11]

Wow, this really help