(19)

(11)

EP 2 396 485 A1

(12)

(43) Date of publication: 21.12.2011 Bulletin 2011/51 (21) Application number: 09784529.1 (22) Date of filing: 06.02.2009

(51) International Patent Classification (IPC):  E04D 13/064(2006.01) (86) International application number: PCT/GB2009/000336 (87) International publication number: WO 2010/089521 (12.08.2010 Gazette 2010/32)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR (71) Applicant: Enverflow Limited Sheffield S26 6PB (GB)	(72) Inventor: SMITH, John, Anthony Sheffield S12 4AB (GB) (74) Representative: Misselbrook, Paul et al Appleyard Lees 15 Clare Road Yorkshire Halifax HX1 2HY Halifax HX1 2HY (GB)