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Steven P. This is very good quality ducting, best I have seen in this style of ducting, Unfortunately not suitable for my need due to the picture difference, in the picture it appears to be smooth between the ribs on the outside, but it does have wrinkles, I wasn't going to use it for ducting but for a robot arm material and wrinkles are not suitable but for air con or any kind of venting this ducting is high class very nice stuff. I will use it somewhere else.
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Tristen I use this for my 4inch and 6 inch ducting..I Can't find a product to match it..so I go back to it everytime..If you want strength and something to compliment a Quiet Ventilation system...this is it
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HUNG N. Good