Exhaust pipe in chimney vent

Instead through wall, thinking to put the exhaust piping of Air- Conditioner (http://www.ebuyer.com/product/128101 ) in the chimney vent.
My flat is on the ground floor with two more floors above me.
I understand that hot exhaust will not fall back in my flat and I do not need to do any packing in the chimney vent.
Piping is flat 1.5cm x 9.5cm
Chimney vent is 17cm x 37cm
Exhaust end of piping I can insert in chimney vent as much as 38cm.
Perhaps in cold season when I may want to use the Air-conditioner for heating I may want whole of Chimney vent blocked.
On examination of the vent I found lot of newspaper stuffed in the vent by previous occupant of the flat. He must have tried to conserve some heat in the flat by stuffing the vent with news papers.
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You might -- the aircon's of that type generate negative pressure in the room.
Which brings me to the second point -- they don't work very well. All that air you are chucking up the chimney (or whatever route to get it outside) has to be replaced by air entering the house, and that brings heat in with it. The air conditioner will spend much energy fighting with itself over this, and not so much on reducing the temperature for you.
If the aircon has a separate air inlet and air path for the air which is exhausted, connect that inlet to the outside too (separately and well away from the exhaust). That will prevent the aircon unit drawing warm air in from the outside to heat your rooms. Not many aircons of this type do have separate air inlets though.
--
Andrew Gabriel
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Andrew Gabriel wrote:

You are right about those portable units. Unless you get an (uncommon) version with a separate inlet they are very inefficient becuase of the high amount of air infiltration.
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Thank you all for responding.
I have purchased http://www.ebuyer.com/product/132907
I just tested it and found it throwing hot air from back side and throwing cool air from front-top.
The room has air vent with electrical fan on it. There are similar units in other rooms and during summer times I let fan on one unit fixed near floor run as the fan only drawas air in and let other vents fixed near ceiling remain open so that air goes out from them.
Aircon is planned to be used only for couple of months in a year in one of the rooms. Intention is to reduced temperature somewhat in the room, the room is not going to be made air tight so air thrown out will get replaced from other rooms.
Thanks again.
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The air will be humid air, mold might grow, when its cold out air falls, it will smell bad. when it rains, it might not exhaust at all.
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