found some on ebay i dont know if im aloud to post ebay links so just incase just search carbon filters and it comes up ... its an air purifier but has a built in carbon filter to eliminate odours and basically exchanges the air to clean air ... good idea if you cant get an extractor fan leading outside or maybe just as an extra precaution ... only 20 quid aswel heres the link

http://cgi.ebay.co.uk/VICKS-HEPA-CLE...item5635735918