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The manufacturers of the fan (Ruston's Lincoln) reckon I won't be able to make the actual motor/fan unit any quieter ?

Pictures as requested. I should have said it is an intake fan - not extract. A prod with a big stick suggests the fan is very slightly out of balance so I'll try to get that addressed. The majority of the noise comes from the fan house - rather than the boom box grain store in my opinion. I can't get an Audacity recording until the weather improves - don't want to push fog into the grain heap. Well we 'sell' the location as being quiet and peaceful so really want holiday cottage guests to be able to sit outside and enjoy the peace, so preferring to kill the noise rather than shut it away but ta for suggestion. If that is all that is needed then an assocutice wall might just be squeezable though it would need to be no more than 6" thick otherwise it would compromise the barn doors. I'll contact the Jackson fencing people - thanks for details. The noise in the fan room is horrendous but if reducing that limits the noise to The Stables then building a small frame around the motor is certainly viable - subject to motor heat issues. Really appreciate all the responses and ideas. Thanks Paul

I've emailed the company who did the rewind to get their input and will mention that. But I'll go and investigate to see if I can turn the fan by hand some how to check.

Now that is a neat simple, cheap idea at least for the motor! I'd need to check how much heat the fan motor body radiates Good idea, will try with a laptop and Audacity. No idea about active noise cancellation - sounds expensive

Well back on with this sound issue,. we've built the Stables holiday cottage and installed triple glazing. Inside the property with all the windows and doors shut the noise from the dryer is difficult to hear ? But it being late summer when the fan is used the guests often want to have the doors and windows open and be outside on the garden bench. Unfortantely one family were unlucky and suffered with the fan running flat out every day from 8 to 10pm (we were very lucky to get the harvest in before the heavy rain and so needed to use the fan to cool the grain) and I fully understood when they complained so I switched the fan off at 4pm when they returned from visiting but is not going to be always possible. I did look at building a wall of straw bales about 10m from the fan intake but by the time the straw had been baled the grain was cool enough not to need airing. I've asked the company who re-wind the motor in 2011 if they can advise why it is so loud. A metal square channel so the air is sucked in from the opposite side to the holiday as suggested might work but that would deflect the noise to a couple of other residences (one of them being my house!) Lourved vents I'll investigate. One question I have is: Would spray foaming the inside of the fan house help to absorb the sound - the fan house is probably 10ft square, mainly brick with absetos sheeting type roof. I wondered if spray all those hard surfaces would absorb some sound before it is reflected internal?

Can anyone recommend an Orangery Supplier that uses aluclad glazing? Or does anyone know of outward an outward opening aluclad triple glazing supplier? Sadly the Internorm supplier we used for our house build has gone into administration and Internorm inward opening windows aren't compatible with the oak frame design we like. We ideally want integral blinds too.

Getting close to Jan 2020, so revisiting this thread We are a farm with various properties built 1800-1900 each with their own septic tank. None discharge directly into a water course, generally into the ground around the tank, so I don't believe any upgrades are needed but can't find any real detail on what is needed though. Ditto - any ideas a year later on?

@JSHarris wow your intake filter sure working hard/ doing a good job. I fitted the extra intake filter box from @bpc ventilation seems to work ok but still amazed little flies are dead in the unit or come out of the vents alive. And the spider was definitely alive inside the unit - feeding on all the little flies going by I guess!

Ok so I'm cleaning my unit after 12 months instead of recommended 6 months. But I'm amazed to find cobwebs and spiders INSIDE the unit! What do other people's mvhr systems look like before cleaning please? Also any tips on how to clean the fan blades please. Toothbrush and soft paint brush sort of works but tedious

Transfers heat between two separate systems. I made an insulated jacket out of a bit of cast off under floor insulation. Amazing it helped get rid of a lot of noise too

Got a product link @Dee J?

I set them about 18 months ago and they were fine it is only recently that they've started coming on rather unnecessarily

Nope ?

@AliMcLeod Cos the came from China I brought a few spares so I can see the model number ? 40-D3GPBT20W220V Brand ZOCHLON Supplier: Zyurong Development Limited Does that help?

@PeterW any ideas how do I tell it is the right/wrong way up?

The moons have aligned and I've been able to access the holiday whilst my son was around to turn the hot tap on! The resistance of the flow switch was: no flow - 24 m Ohms flow - 33 k Ohms I'm surprised at such a high resistance for the 'on' value.

Keep us posted if this works please

While I wait for postie to delivery the new spikes I think the birds are taking the Micky building their nest on my home made bird protection system!

Got some fairly cheap PIR security lights around my house. The older ones are now starting to come on whenever they detect motion even if it is a bright sunny day. They worked fine for 18 months or so. Fiddling with the settings seems to have little impact, though can't be 100% sure I fiddled all the options. Does the ambient light sensor drift over time normally? It is not a major issue just a bit odd

Got a camera inside my porch but the swallows have taken to sitting on it and therefore I've bird muck all down the wall and on the post box below. Easy problem to sort that I thought, I'll stick some nails on it. The birds sit and sh*t on the nails ? any other ideas please?

I've only proven this by turning the controller to 'ON' but yep good idea I'll have to wire in a manual switch. Ah that makes a lot of sense. As this is issue is in our holiday cottage, (insert holiday cottage plug here: https://www.holidaycottages.co.uk/east-of-england/lincolnshire/the-stables-in-the-wolds) I have limited opportunity for testing. June is next testing time. Will report back then. Yes I'm not a fan of the screwdrivers at all but it was all I could use one handed (due to installation and time restrictions) and I'm very curious to know what a half-lit/dimmed lit screwdriver is tell me. (On a known live, in the same physical location it lights up correctly)

I'd normally use a multimeter but do the installation location it would be a two man job. However I'll try to recruit someone to get a proper reading. Especially as I'm curious what a half lit screwdriver means. Thanks for explanation of the top knob.

One of these controllers is suppose to start a pump to run a hot water feed circuit loop when a dip water pressure occurs when a tap opens. However nothing happens. The sensor seems to react, in that a electrical screw driver lights up when the tap is open. But note the screwdriver is dimly lit all the time. The controller is set on Wu and 10 seconds. What function does the top switch do? The data sheet says this is the 'time adjusting knob' but it seems to have no effect. Switching the unit to 'On' and the bottom led comes on and the pump runs.

I'm glad to report the new Salus units are working perfectly. Took 20 mins for the bathroom to go from 16 to 19.5 degrees - was taking 36 hours before!

New units arrived ? Salus support report: "Since ABA release we have been made aware of occasional issues with smaller UFH circuits and/or working at lower temperatures. Our latest firmware release for ABA overcome this issue and I am happy to send you replacement units"