David Bolton Getting the Sequence Right: How to Select a Door Coordinator for Closer Pairs Why Closer Pairs Need a Coordinator If you have ever watched the active leaf of a double door slam shut before the inactive leaf had a chance to clear the astragal, you already understand the problem ... door closers door coordinators fire-rated hardware hardware specification paired doors Oct 22, 2026
David Bolton Closer Template Marking for Retrofit: How to Locate Holes Accurately When the Original Prep Is Gone Why Template Marking Is the Most Skipped Step in a Closer Retrofit This article is for maintenance technicians, commercial subcontractors, and facility managers who are replacing a worn or failed door... closer templates commercial door hardware door closers installation retrofit Oct 12, 2026
David Bolton Door Closer Body Crack vs. Valve Failure: How to Tell Which Problem You Actually Have Before You Order a Replacement Why the Diagnosis Matters Before You Touch the Order Form A door closer that no longer controls speed, slams shut, drifts open, or leaks fluid sends the same distress signal regardless of root cause. ... closer maintenance commercial door hardware door closers fire door compliance hydraulic valve failure Sep 27, 2026
David Bolton Double-Acting Door Hardware Sets: What Changes When the Door Swings Both Ways What This Article Covers -- and Who It Helps A double-acting door swings freely in both directions from a centered rest position rather than stopping at a frame stop like a conventional single-acting ... commercial door hardware door closers door hardware sets pivots and pivot sets push-pull trim Sep 24, 2026
David Bolton ADA Closer Spring Force: The Field Adjustment That Determines Whether Your Door Passes or Fails What This Article Covers -- and Who Needs It A door closer that is wound too tight is one of the most common ADA compliance failures in commercial buildings -- and one of the easiest to miss during a ... ADA compliance accessibility commercial hardware door closers spring force Sep 16, 2026
David Bolton Closer Torque Rating vs. Door Inertia: Why the Physics of Your Opening Determines the Right Closer Size What This Article Covers -- and Who It Helps When a closer fails to latch a heavy corridor door or slams shut faster than it should, the instinct is to blame the spring adjustment. The real cause is u... ADA compliance ANSI A156.4 closer sizing commercial hardware door closers Sep 6, 2026
David Bolton Cam-Action vs. Rack-and-Pinion Door Closers: Which Mechanism Belongs on Your Opening? Two Mechanisms, One Job -- But Very Different Results This article explains the mechanical difference between cam-action and rack-and-pinion door closers, when each design has the advantage, and how t... ADA compliance cam-action closers commercial hardware door closers specification guide Sep 5, 2026 Our Blog
David Bolton Door Closer Spring Size by Door Width and Weight: Getting the Number Right Before You Install Why Spring Rate Is the First Closer Decision, Not an Afterthought This article helps contractors, facility managers, and specifiers choose the correct door closer spring size based on door width and w... ADA compliance closer sizing commercial hardware door closers spring rate Sep 4, 2026 Our Blog
David Bolton Plain Bearing vs. Ball Bearing on a Door with a Closer: Why the Closer Is the Decision-Maker The Closer Changes Everything About How a Hinge Wears This article is for commercial contractors, facility managers, and architects who are specifying or replacing hinges on doors that carry a door cl... commercial hardware door closers hardware specification hinges maintenance Sep 3, 2026 Our Blog
David Bolton When the HVAC Changes, Your Door Closers Need a Second Look Why a New HVAC System Can Make a Perfectly Good Closer Fail This article is for facility managers, mechanical contractors, and building engineers who have noticed that doors are slamming, not latching... HVAC and door hardware closer adjustment door closers facility maintenance fire door compliance Sep 2, 2026 Our Blog
David Bolton Why Plain Bearing Hinges Get Replaced Before Their Time: Understanding Load, Use Frequency, and the Closer Pairing Rule The Hinge Nobody Questions Until It Starts Sagging Plain bearing hinges are among the most common hardware items on a commercial project, and they are also among the most commonly misapplied. This gui... commercial doors door closers hardware specification hinges plain bearing Sep 2, 2026 Our Blog
David Bolton Why Your Door Closer Slows Down in Winter -- and What to Do About It The Problem That Starts Every January When outdoor temperatures drop, facility managers and maintenance crews across schools, healthcare campuses, and industrial plants start fielding the same complai... closer adjustment cold weather hardware door closers exterior door hardware facility maintenance Aug 25, 2026 Our Blog