Wood pellet stove fan noise

[thehat]

We have an MCZ Musa Hydro wood pellet stove which provides all of our hot water in winter, and central heating. It's fantastic, and it was a good decision. A drawback is noise - I can live with the fan noise as the stove fires up and down in our living room, but it is also making noise outside which is apparently disturbing the neighbours. The flue pipe comes straight out the back and through the wall into the adjoining garage, then straight up and out the garage roof. I suspect the garage is acting like an echo chamber - if you walk by outside there's a droning noise, which is rather louder than is neighbourly.

Has anyone else come up against a similar issue? Is there any mileage in lagging the flue pipe to muffle things, assuming it's safe to do that? (It never gets more than warm to the touch.) Should I try to soundproof the garage - eg padding the up-and-over metal door? Suggestions welcome! Thanks.

[dhaslam]

It is no harm to  insulate the flue anyway but  that seems the best option for sound.   I suppose you will need to use something  like rockwool and box it in.   

[thehat]

Just in case anyone else ever has this problem... In the end we solved it (not 100%, but significantly) by adding a special silencer to the top of the flue pipe. Two or three of the main twin wall flue manufacturers seem to make these (about £200).