Cavity wall insulation issue

[cyber69]

I had EON over today to install some free cavity wall insulation and everything seemed to go okay with it but I noticed that the polystyrene beads which they blow into the cavity have somehow found their way into the kitchen extractor fan and the ducting!

I've just spent an hour with the vacuum cleaner sucking most of the beads out of the actual extractor fan itself but the ducting is full of these small beads and when I look into the hole in the wall where the ducting goes it's jammed solid with these beads.

I've called EON but was told that they will call me back on Monday when the relevant department is back in.

I would presume that EON are liable to put this right?

 

[cyber69]

There's like a piece of flexible tubing which goes into the cavity and then to the outside vent so I guess the beads have found their way in somehow through maybe a tear in this tubing which looks like the tube on a tumble dryer.

 

[cyber69]

The flexi pipe ontop of the kitchen units can be seen here

I've vacuumed all the small beads out of it and then had a look at the outside vent

I took the grill off and vacuumed all the beads out of this end also and tried to put my hand through to see if it was clear but found that the outside vent is higher than the internal so the flexi pipe in the cavity moves the air upwards and outside.

I tried feeling inside from the kitchen and don't think the flexi pipe was ever joined all the way through so the kitchen fumes are venting out into the cavity space and then making their own way outside eventually through the vent. I tried burning some paper from the kitchen and could smell the smoke from the outside so I know it's getting out.

As it's probably always been like this for years and now I've cleared out the extractor fan and it's working again (in a fashion), is it worth paying for someone to come out and try putting a replacement flexi pipe through the cavity space? or leave it like it is? I don't know if it is doing any long lasting damage by venting the kitchen fumes into the cavity space before they go outside?

 

[cyber69]

I'm tempted to try and replace the tubing myself but really want the job doing properly. What sort of tradesman would I have to call for this kind of job?