Knowles - Part of Sentry Doors is the UK leader in timber fire safety and security doorsets. We are manufacturers of bespoke, fully certified, timber fire and security doorsets across the social housing, care home, education, healthcare, commercial, leisure and residential markets. Throughout the generations of the Knowles family, we have continuously developed to suit the needs of the construction industry. We now offer products that are FSC certified, this non-profit organisation works to promote the sustainable management of the world’s forests. Sustainable materials are important to us as ever-growing concerns over sustainability shape the world of British and European manufacturing.