The gap in between the floor and also a steel doorway is generally 8mm to 10mm although it could be tiger for protection requirements. CDF will supply Slash down and restyling for customized-sized doors to satisfy any custom opening. Be sure you review our width and height sizing chart in http://www.aroundhendrickscounty.com/california/yorba-linda/home-remodeling/euroline-steel-windows-doors