This heat recovery fan was awkward to fit due to the 750mm random rubble stone wall ! ! ! This would have been the same for any fan.
The room is in the basement and its used as a sewing room with masses of expensive material stored in it - damp not wanted in here!!
I sealed the concrete floor with a two pack epoxy and carpet tiled it. But ventilation was the problem. KAIR information was comprehensive and the fan cost more than a simple humidity fan.
IT IS BRILLIANT - once installed and the humidity set on the edge of slow to fast we moved all the material into the room. Well we waited two weeks with the room closed up. The fan went from slow to fast at will. The sewing room was set up and the fan re-adjusted for occupancy.
In the depths of winter, wet rather than cold, the fan warmed the air coming in and took stale and moist air out 24 hrs a day.
The fan goes into fast mode the minute the steam iron is switched on, before you even notice the steam.
I would recommend this Kair Heat Recovery fan to anyone with similar room needs. I'm so glad that I didn't waste money on some bathroom fan that would do the job.
Sewing room fully operational, no sign of damp, air fresh and never stuffy, ten Brownie points for me with such a good job done.