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--- mywiki:info:aircon [2015/04/12 11:05] – [What is the best aircon brand in Singapore?] shaoguoh
+++ mywiki:info:aircon [2019/09/15 18:55] (current) – external edit 127.0.0.1
@@ Line 23: / Line 23: @@
 Class 1 & Class O = Fire Propagation Test Standards for insulation. In simple terms, the insulation inability to burn.
-Grade = Actually it should be Gauge. It is an industrial term to describe thickness of metal. In our case, thickness of the copper pipe. 'Grade 23' means 0.61mm thick.
+Grade = Actually it should be Gauge. It is an industrial term to describe thickness of metal. In our case, thickness of the copper pipe. Grade 22 is 0.71mm, Grade 23 is 0.61mm and Grade 24 is 0.56mm. This has nothing to do with the chemical content. But generally, a thicker copper is able withstand a higher operating pressure. Surely the manufacturing process also plays a very important part.
 Insulation = the foam or rubberly 'layer' covering the copper pipe. Its function is to prevent heat gain.