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Plumbing and Gasfitting Forum > Support > Plumbing and Gasfitting Registration / Craftsman Exam Support > 

afew basic gas registration questions im stuck on.

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Author Topic: afew basic gas registration questions im stuck on.  (Read 114 times)
brook
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« on: June 13, 2010, 05:12:40 PM »
4) four factors that determine the number of air changes per hour required in heating and ventilation systems?
 
 
 
5) is a natural draft flue the same a open flue?
 
 
 
6) Difference between direct acting thermostat and indirect acting thermostat?
 
 
 
7) There are two types of domestic hot water systems. Instantaneous and indirect. what is indirect? is this storage water heater?
 
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