David Bolton Specifying Ball Bearing Hinges for Commercial Doors: Size, Finish, and Fire-Rating Essentials Why Ball Bearing Hinge Specification Matters More Than Most Specifiers Realize Choosing a hinge sounds straightforward until a door starts sagging six months after opening day, a fire inspector flags ... ball bearing hinges commercial hardware specification door hinges fire door hardware stainless steel hinges Apr 22, 2026 Our Blog
David Bolton Security Door Window Lites on Wood Doors: A Specifier's Guide to Glass Selection, Code Fit, and Installation Reality What Is a Security Door Window Lite — and Why Does the Glazing Material Matter? A security door window lite (also called a vision lite, door glass insert, or door lite frame) is a framed glazing unit ... commercial door components fire door hardware security door lites vision lite installation wood door glazing Apr 22, 2026 Our Blog
David Bolton Fire-Rated and Acoustic Automatic Door Bottoms: A Specifier's Guide to Getting the Assembly Right What This Guide Covers Automatic door bottoms that carry both a fire rating and an acoustic (sound attenuation) rating occupy a narrow but critical position in commercial hardware scheduling. Specifyi... acoustic door seals automatic door bottoms code compliance door gasketing fire door hardware Apr 22, 2026 Our Blog
David Bolton Astragals for Double Doors: Problems, Benefits, and the Right Solution What Is an Astragal -- and Why Does It Matter? An astragal is the hardware component that seals the gap between the two leaves of a pair of doors -- the meeting stile . Without one, that center gap be... astragals commercial door gasketing double door hardware fire door hardware meeting stile seal Apr 19, 2026 Our Blog