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Finally got a minute between holidays and shopsitting to edit the photos and get the vents fitted with the help of a neighbour who is a carpenter by trade. He had to replace 5 T&G boards that had popped and split, fitting the vent at the same time. He trimmed the flange to a circle so that it looked more like a porthole and a bit more decorative.
The vent on the cabin seems to be working so far. We did have a hiccup n Saturday when we found moisture out there, but the ceiling was still open at the apex and we think the insulation foam was sweating. Since it has been sealed back up again it has been fine. Is it similar to the dehumidifier in that in that it works best with the doors shut, or shouldn't it make a difference?
The one on the shed has already had the effect of cooling it down and freshening it up as it was very stale and musty smelling in there before. I think our 5 squirrels think we have bought them a new shiny toy!
A couple of local guys who are builders are very impressed with the vents, and the guy who fitted it thought it was absolutely brilliant. I really think there would be a market for them over here, so if you ever want an agent, let me know!
Janet was kind enough to extend her comments with this follow-up review
We have had a 17'x10' cabin in the garden now for 9 years, purpose built to house a hot tub with a shower and toilet. It was built as a solid garden room with double glazing, underfloor heating and insulated double thickness roof and walls, but it soon became clear that it was too well insulated and we were having condensation problems, even when the hot tub wasn't on.
We had fitted an extractor fan from the outset but it could not cope. We added extra ventilation grills on the walls, and it was still bad, getting much worse when we had to turn off the underfloor heating as it was too expensive to run. The whole dynamics changed, exacerbated by felling the conifer trees that previously shaded the building from the sun for most of the day.
It was "raining" condensation from the roof, even after we installed a dehumidifier as high up on the wall as we could get it. The apex was still dripping water and the tongue and groove boards were popping out.
Having decided we needed a wind turbine vent I started looking around and found that they are not around over here, so followed Google to the US where I found the Aura Vents. I spoke to Martin several times on the phone about the best sizes and he was very helpful but a little unsure that the vent would be able to deal with the steam from the hot tub.
We eventually bought a 12" telescopic vent for the cabin, and added a 6" vent for the shed, which also suffered from being unventilated and got very stuffy and musty smelling. A neighbour who is a carpenter fitted them both easily and repaired the ceiling at the same time. We trimmed the flange on the large vent to look a little like a porthole so that it was more decorative.
I have to say that cutting a 12" hole in the roof was a little scary but I wish we had known about these vents 9 years ago as it has cured all the problems with no leaks! We have now disconnected the fan and sold the dehumidifier on eBay, and the cabin is well aired with no condensation, whatever the temperature outside.
When the hot tub is on, there has always been an inversion layer of steam which used to take a long while to clear but now it disperses very quickly and the room stays dry. Even the shower curtain now dries out properly instead of "stewing" and going mouldy.
We are so impressed with these vents, and the problems we had have been cured for a very small outlay, plus the electricity bill has gone down sharply. We would thoroughly recommend them, especially for dealing with hot tub enclosures.
Janet and Thomas McPherson, Bath England