Any problem with using a flue for an air conditioner?

One of my sons is renting a room and wants to use a small free standing air con unit. Venting through the window is not feasible but there is a vent in the blanked off chimney breast that has a good draught. Can anyone forsee possible problems with using this for the air coming out of the AC? I wondered about condensation.
Peter Scott
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On 01/08/2010 16:26, Peter Scott wrote:

If its the type that collects water in an internal tank, then the exhaust ought to be basically just hot air. The posher ones however re-evaporate their condensate on the hot side of the heat exchanger and expel moist air. The latter type would not be suitable.
--
Cheers,

John.

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On 01/08/2010 17:31, John Rumm wrote:

Thanks very much for that. For posher I guess you can read more expensive. We are looking at smallish cheap ones, so I think I now need to look for one that has a tank.
Peter Scott
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Peter Scott wrote:

Most portable units only have marginal ability to overcome friction in their outlet pipes. I connected one to about 3m of vertical open ended soil pipe a while back and it virtually stopped working. This was one with a tank. A lot depend on whether you have a separate air inlet into the room. If not then the A/C unit is trying to pump air out of a sealed box. If you do have an air inlet then this could bring in warm humid air so whilst you have a good airflow now, the cooling and dehumidifying effect is compromised.
Basically , don't expect these portable units to work anything like as well as a 2 part fixed installation.
Bob
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On 01/08/2010 18:47, Bob Minchin wrote:

Good point. Thanks. Looks like we might have to try to make some sort of horizontal vent. Can't cut the glazing and he's not happy to leave a window opening as it's a ground floor room in a fairly dubious area.
Peter Scott
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