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]