Oddly enough I'd been looking at PIV units a couple of days back. No real issues with damp or condensation, but like to keep it to a minimum and felt it was a good means of introducing airflow.

Think I've settled on the Nuaire Drimaster Eco Heat HC. Don't intend using the heater much, but it seems a sensible option to have in colder weather.
That's exactly the one we always use, excellent bit of kit - although some customers opt for the unit without the heater. In all honesty the relatively gentle air input wouldn't unduly lower the temperature within the house in my view, and you can wire these straight off the nearest suitable lighting circuit with no concerns. 'HC' is quite important as it means 'Hall Control' where the speed control is mounted on the diffuser under a clip on cover - the other type- 'Loft Control' are a bit cheaper but you have to get in the loft to access the controls - bit of a PITA. :)
[The ducting is a bit fiddly to connect due to its size but you get the hang of it after you've installed about 50]
 
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That's exactly the one we always use, excellent bit of kit - although some customers opt for the unit without the heater. In all honesty the relatively gentle air input wouldn't unduly lower the temperature within the house in my view, and you can wire these straight off the nearest suitable lighting circuit with no concerns. 'HC' is quite important as it means 'Hall Control' where the speed control is mounted on the diffuser under a clip on cover - the other type- 'Loft Control' are a bit cheaper but you have to get in the loft to access the controls - bit of a PITA. :)
[The ducting is a bit fiddly to connect due to its size but you get the hang of it after you've installed about 50]

Need to measure the landing ceiling to see if it goes over the landing or stairs (hall control a little less useful in the latter instance). Loft access is easy enough, but local control seemed a useful addition - especially given the additional cost of wall switches.

I'd figured unheated would probably be fine, but figure it might be nice to have the option of keeping the chill of introduced air on very cold days. I don't mind spending on the right gear, but misery will prevent heater being used in all but the most extreme cold weather.

I had looked at the newish Vent Axia units, which are competitively priced, but prefer the idea of cable suspension - that and a general aversion to Vent Axia products.
 
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Oddly enough I'd been looking at PIV units a couple of days back. No real issues with damp or condensation, but like to keep it to a minimum and felt it was a good means of introducing airflow.

Think I've settled on the Nuaire Drimaster Eco Heat HC. Don't intend using the heater much, but it seems a sensible option to have in colder weather.
Thats one of the best
 
Work got back on the track but products price has increased a lot due to post covid inflation.
 
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