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  • 61-63 Normanby Road, Mt Eden 1024
  • 09 6234108
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Monday 6:30 am - 5 pm Tuesday 6:30 am - 5 pm Wednesday 6:30 am - 5 pm Thursday 6:30 am - 5 pm Friday 6:30 am - 5 pm Saturday Closed Sunday Closed Public holidays Closed

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HOW STIFF IS YOUR PIPE?

Ever wondered what the stiffness rating of your Iplex Volta™ ducting pipe is? 
The stiffness of your duct is measured by a class rating called the Nominal Ring Stiffness or SN.

The higher the SN class rating your ducting has; the higher the resistance to deflection. 
Typical SN ratings in the Iplex Volta range are:

Medium duty ducting MD – SN4 

Heavy duty ducting HD – SN10 

Very heavy duty ducting VHD – SN25 

Made to order for specific projects

The duty classification SN rating can be found as part of the digital print on the side of the Iplex Volta™ duct.

SN rating found here

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©Copyright Corys Electrical 2026
©Copyright Corys Electrical 2026