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 Pull Side vs. Push Side Closer Mounting: How to Choose the Right Position Before the Door Goes In Why Mounting Position Is the First Closer Decision, Not the Last This article explains the practical difference between pull-side and push-side door closer mounting, when each position is the right ca... closer mounting commercial hardware door closers parallel arm pull side push side Sep 19, 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 Surface-Mounted Door Closer Selection: The Five Decisions That Determine the Right Unit for Your Opening What This Guide Covers -- and Who It Is For Choosing a surface-mounted door closer sounds straightforward until you are standing in front of a 4-foot exterior fire-rated door in a school corridor or a... ADA compliance NFPA 80 commercial door hardware door closers surface closer selection Sep 10, 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
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
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
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
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
David Bolton Why the Door Coordinator Is the Most Overlooked Item on a Closer-Pair Hardware Schedule What This Article Covers -- and Who Needs It If you are specifying or installing surface closers on a pair of doors, the door coordinator is not optional hardware -- it is the device that makes the en... door closers door coordinators door pairs fire door hardware hardware scheduling Aug 30, 2026