Who can answer this little riddle

Question

What goes up a chimney down but not down a chimney up

Answer 1

smoke, air, dust.....

Answer 2

an umbrella, its an old one  

Answer 3

A sweep's brush?

Answer 4

An umbrella.  

Answer 5

I don't get it, why is it a brolly?

Oh wait, I re-read it...get it now :)

An umbrella (ella, ella, eh, eh)

(under my umbrella)

Answer 6

So old, but good.

Answer 7

An Umbrella :)

Answer 8

umbrella

Answer 9

An umbrella  

Answer 10

i dont know

santa :S?

Answer 11

the smoke?

Answer 12

smoke duh

Answer 13

Gosh let me think lol it is an umbrella

Answer 14

An umbrella

Answer 15

evry1s sayin umbrella so a rubber chicken

Answer 16

I was going to say smoke...but then i noticed you'd put umberella lol...i dont really get it lol. (:

Answer 17

I have no idea what you are on about!

So i'll steal the answer off ones above me, an Umbrella