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They work with convection so the hot air rising from the fire up the chimney decides the direction. Either you need a huge j to move enough air to make it work or do it while the fire is on so the chimney is in action at the time, both seem hard to do...
When the fire isn't on the chimney will likely work the other way with wind blowing down it.
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does all the sticky goodness come out of upstairs' fireplace?
No, the two flues are separate, that's why there is chimney pot per fireplace, not just one big one for the whole chimney breast which might serve many fireplaces in a town house.
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This post cracked me the fuck up
Clockwise
gbj_tester
Crispin_Glover
@clipon
how do chimneys work? If I smoke a j with my head up in the fireplace because next door's ghastly mother has come round and is complaining in their garden so I can't go outside does all the sticky goodness come out of upstairs' fireplace? Most of the spirits are going up the spout and the room smells remarkably unlike the praises of jah have been sung so I would like to continue in the immediate short term with this plan as long as I can be reasonably confident of not wafting dank evidence around the whole building. Please help.