extractor fan with plug socket cord?

when you buy an extractor fan do they come as "plug in", or do they need wiring into the wall??

i havn't a clue when it comes to electrics, but my house stinks so does outside, and i need to sort it ASAP!!!

i.e -

http://cgi.ebay.co.uk/IN-LINE-DUCT-EXTRACTOR-FAN-HYDROPONICS-100-mm-4_W0QQitemZ170312733171QQcmdZViewItemQQptZUK_Home_Garden_Hearing_Cooling_Air?hash=item170312733171&_trksid=p3286.c0.m14&_trkparms=72:1686|66:2|65:12|39:1|240:1318

Most of them have cordset built in.

okay thanks

I would say you better ask. There are 2 versions- do or dont. Most companies will make one for you if you ask or you can do it yourself.