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13 Articles

hollow metal doors ×

SDI Door Categories A Through E Explained: What Each Label Means Before You Spec a Hollow Metal Door

What This Article Covers If you specify, purchase, or install hollow metal doors, the Steel Door Institute (SDI) category system controls which door type belongs in which opening. Categories A through...

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Nov 7, 2026

Closer Reinforcing in Hollow Metal Doors: What the Prep Code Means and Why It Matters at the Jobsite

What This Article Covers This post explains what closer reinforcing is in a hollow metal door, how it gets specified at the factory, when it matters in the field, and what happens when it is missing o...

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Nov 5, 2026

ASTM F2927 and Blast-Resistant Doors: What Specifiers Need to Know Before Writing the Opening

Why Blast-Resistant Door Specifications Start With the Right Standard This article is for architects, security consultants, and construction managers who need to specify blast-resistant door assemblie...

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Oct 15, 2026

Hinge Shimming in the Field: How to Fix Door Alignment Without Pulling the Hardware

When the Door Is Hung but Not Right: A Field Alignment Problem Every Installer Knows This guide is for commercial contractors, school and facility maintenance staff, and anyone responsible for keeping...

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Sep 1, 2026

Exit Device Prep on Hollow Metal Doors: What Gets Cut Wrong Before the Device Ever Ships

Why Door Prep Is the Decision That Happens First -- and Hurts Last This article is for commercial subcontractors, door and hardware suppliers, and facility project managers who specify or install exit...

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Jul 26, 2026

Why Ball Bearing Hinges Wear Out Faster Than They Should: The Maintenance Mistakes Killing Commercial Door Hardware

The Hinge That Should Last Decades But Does Not This article is for facility managers, maintenance technicians, and commercial contractors who keep seeing ball bearing hinges fail long before their se...

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Jul 9, 2026

Steel Door Window Lite Kits on Hollow Metal Doors: Why the Glass Spec Gets Locked In Before the Fire Rating Is Confirmed

The Problem That Happens Before the Kit Ships This article is for contractors, facility managers, and architects who are sourcing window lite kits for hollow metal doors. Specifically, it covers one o...

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Jun 7, 2026

Retrofit Window Lites on Steel Doors: Why the Glass Spec Gets Finalized After the Door Is Already in Service

Why This Decision Keeps Getting Made in the Wrong Order This article is for facility managers, commercial contractors, and maintenance teams who need to add a vision panel to a steel door that is alre...

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Jun 3, 2026

Steel Door Window Lite Kits: Why the Glass Spec Gets Finalized After the Door Is Already on Order

What This Article Covers and Who It Helps A steel door window lite kit sounds like a simple add-on order: pick a size, pick a glass type, done. In practice, the glass specification for a door lite is ...

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May 21, 2026

Corner Radius on Commercial Hinges: Why the 1/4-Inch Detail Decides Whether the Hinge Fits the Door

A Small Radius, a Real Field Problem This article is for contractors, facility managers, and architects who specify or order commercial door hinges. It covers one of the most overlooked details on a h...

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Apr 23, 2026

Aluminum Astragals on Hollow Metal Door Pairs: Why the Seal Material and Finish Have to Be Decided at the Opening Stage

What This Guide Covers and Who It Is For When a hollow metal door pair goes in and the gap at the meeting stiles leaks air, water, sound, or smoke, the astragal is almost always the fix. But specifier...

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Apr 23, 2026

Steel Flat Bar Astragals on Hollow Metal Door Pairs: When the Opening Tells You Which Profile to Use

Why the Astragal Profile Decision Gets Made at the Wrong Time This article is for contractors, facility managers, and hardware specifiers who are responsible for hollow metal door pairs in commercial,...

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Apr 23, 2026

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