QUESTION 9
(a)  State SIX factors that have to be considered when selecting the type of heating and 
air-conditioning required in a room. 
  1         
  2         
  3         
  4         
  5
  6     
(6 marks)

(b)  State where the air/dust filter is usually located on a ducted warm air central heating
system.



(1 mark)

(c)  (i)  State the device used to prevent a central heating furnace from overheating should
the control thermostat fail.
 
(ii)  State the outcome if this device is activated.

(2 marks)

(d) State the effect of ducting return air back to the furnace.


(1 mark)
(e)  State where an air supply grill should be positioned in a bedroom to provide the most
efficient distribution of heated air.


(1 mark)
Total 11 marks

Linkback: https://forum.plumbers.nz/plumbing-exam-june-2007/23/question-9/169/