A unique feature of multizone and double-duct systems is that ...

[Frost2351]

A unique feature of multizone and double-duct systems is that they:
 
  A) Will fit in tight spaces.
  B) Can deliver conditioned air to different zones.
  C) Can heat and cool at the same time using a single air handler.
  D) Operate more efficiently than most other systems.

Question 2

How have newer versions of the check valve been modified?
 
  A) They are now part of metering devices.
  B) The metering devices are now inside the check valves.
  C) They are now insulated.
  D) One check valves can now connect to two metering devices.

[AaaA]

Answer to Question 1

C

Answer to Question 2

A

[Frost2351]

Great answer, keep it coming

[nyrave]

Thanks for the timely response, appreciate it