Mvhr ducting damage

[Dunny1234]

Been Installing mvhr ducting. Whilst feeding it through posi joists, I’ve noticed areas where the ducting has been caught on the sharp bits of metal on the posi joists. It seems the damage in mainly on the ribbed areas. Is it fit for purpose? Thanks 

[MJNewton]

With the ducting being fully lined I wouldn't expect it to be an issue, assuming the damage hasn't gone all the way through. If it were me I'd wrap it in duct tape just to be sure. Actually, I'd probably wrap it with aluminium tape first then duct tape as I like to over-engineer things.. 

[ProDave]

That's twin wall ducting with a smoother (usually white) inner layer?  As long as the inner layer is not damaged it will be fine.

 

I would just give the damaged outer layer a wrap of air tightness tape just for good measure.

[JohnMo]

You could also inject some CT1 or similar, before taping

[Bonner]

I would do all of the above, just to make sure ?