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5 Articles

hardware schedules ×

Communicating Function Locksets: When Both Sides of the Door Need a Key

What Is Communicating Function on a Door Lock? This article covers the communicating lock function (commonly coded F15) -- what it does, where it belongs, and the specifying decisions that trip up eve...

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Aug 18, 2026

The Case for a Fourth Hinge: When Three Just Is Not Enough

Why the Three-Hinge Default Leaves Some Doors Underhung Most commercial doors get three hinges and move on. For a standard 3'0" x 7'0" x 1-3/4" hollow metal door in an office corridor, that is exactly...

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Aug 11, 2026

Passage Function vs Night-Latch Function on Exit Devices: Choosing the Right Outside Trim for the Opening

Why the Outside Trim Function on an Exit Device Is Not a Minor Detail This article explains the operational difference between passage function and night-latch function on exit device outside trim, an...

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Jul 19, 2026

Classroom Function Exit Device Trim: Why the Outside Lever Choice Gets Misread Before the Hardware Set Ships

What This Article Covers and Who It Helps Classroom function exit device trim is one of the most frequently misread entries on a hardware schedule. It looks like a lever trim option, but it controls a...

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Jul 4, 2026

Dummy Trim vs Night Latch Trim on Exit Devices: Picking the Right Outside Function Before the Door Gets Prepped

Why the Outside Trim Function Gets Chosen Last and Causes Problems First This article explains the practical difference between dummy trim and night latch trim on exit devices, who each function is ri...

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Jun 27, 2026