FiWi HR vent

[Greengauge]

Interested in the FiWi vent system for a retrofit of a small (~25m2) office and bedsit on 1st floor (will probably be 2 independent systems).

I found this thread from a while back
https://aecb.net/forum/index.php/topic,2569.0.html
but wondered if anyone has any more up to date experience of these systems?

I'm a little dubious about the claim that they can equalise the pressure by monitoring the temperatures, over the long term great but surely ther's to much lag to take, e.g. a 10 second door opening event, or a gust of wind into account?

[Anonymous]

The only real world feedback I've seen from these has been from VikingHouse over on the Green Building Forum. He's a strong advocate and has published quite a bit of information. I haven't seen him post much on the forum lately but believe that he's still around.

He has them manufactured specifically for him – I don't think I've seen any commercially available.

[Greengauge]

Mark, I'd probably advocate them strongly if I was selling them 😉 but that's not to say they aren't good, I'd just like an independent opinion if there's one to be had.

Dave: “4 electronic thermostats in the 4 airstreams are connected to the electronic Brain which controls the motor speeds, maintaining a high efficiency when the wind blows or a door is opened.” from the viking website http://www.viking-house.co.uk/fine-wire-hrv.html

I agree with your point about HX efficiency and ducting but in this case we have 1 room on each floor plus WC, possibly WC/shower on ground, and bathroom on 1st. Am considering a WiFi for each of the main spaces, and maybe one of those through the wall HR units that are designed as drop in replacements for standard extracts for the wetrooms. It just seemd a sensible alternative to full MVHR given the size and layout, and that the bedsit and office are likely to be occupied at almost exactly opposite times.

There's also a chap on the navitron forum that's acquired the bare HX and has been experimenting with incorporating it into a ducted system:
http://www.navitron.org.uk/forum/index.php/topic,15839.msg177733/topicseen.html#msg177733

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