Eberspacher ducting - original or aluminium?

[ChattingLil]

I need a new bit. Shocked at price!
Found aluminium ducting that vendor says it is suitable and is one third of price.
Any reasons not to go for it?

 

[sailorman]

Talk with Dave 2468, or what ever the numbers are. he will advise & his base near to you.
i had the solid stretchy stuff, DONT get the thin coated stuff with the spiral support, it is intended for a/c systems with low heat outputs.
Also consider the webasto insulated sleeve, expensive but superb. my heater has never been so good, even get heat & better volume out of the last outlet