the coveted (NF) seal of approval is awarded by the independant Centre technique du Bois (CTBAS) olny after extensive and vigourous tests not just on  the finished items and products but also on all the materials and components used in their manufacture and construction. These test are regulary repeatead. The (NF) Seal of approval conferred upon SAGNE is your assurance of the quality and raliability of all our products.