Doors 101

Choosing the right commercial exterior doors is one of the most important decisions when designing, constructing, or renovating a commercial building. The right door impacts security, durability, energy efficiency, code compliance, and curb appeal. At CDF Distributors, we work with contractors, facility managers, business owners, and property developers every day to help them select the best door solution for their specific needs. Whether you're looking for commercial metal exterior doors, commercial exterior glass doors, or guidance on where commercial exterior wood doors fit into a project, our team has the expertise to help you make the right choice.

In this guide, we'll compare three of the most common types of exterior commercial doors: hollow metal doors, metal building doors, and storefront doors. We'll cover their similarities, differences, ideal applications, and which option is best for your project.

What Doors Are Compatible with Exterior Applications?

Several door types can

Industrial doors are designed to meet the demands of high-traffic, high-impact environments such as warehouses, manufacturing facilities, distribution centers, and metal buildings. Unlike standard doors, industrial doors are built for durability, security, and performance, often incorporating reinforced materials like steel, specialized hardware, and compliance with strict safety and fire requirements.

Whether you're looking for industrial steel doors, industrial glass doors, or durable exterior steel doors, the right solution needs to balance strength, function, and long-term reliability. That's where choosing the right industrial door supplier makes all the difference.

Industrial vs. Commercial Doors: What's the Difference?

While industrial and commercial doors are often used interchangeably, there are key differences in performance expectations and application.

Similarities

• Both must meet building codes and fire ratings (read about how doors are fire rated here)
• Both are typically built

Commercial door sizes are one of the most important specifications on any construction project. Selecting the correct door width and height affects code compliance, accessibility, safety, occupant flow, hardware selection, and overall building performance.

Whether you are purchasing commercial metal doors, commercial wood doors, storefront doors, wind-rated doors, or metal building doors, understanding standard commercial door sizes can help prevent costly delays and installation issues.

This guide covers standard commercial door widths, average commercial door heights, common door size combinations, and the standard dimensions available across the most popular commercial door types.

What Is the Standard Commercial Door Size?

The most common standard commercial door size is 3'0" x 7'0" (36" x 84").

This commercial door width and height combination is widely used in office buildings, schools, healthcare facilities, multifamily housing, retail spaces, warehouses, and industrial buildings.

When planning a commercial door installation, many people ask: what is standard door size, and can it be used in a non-standard opening? The answer is yes, and in most cases, it’s the smarter approach. At CDF Distributors, we strongly recommend using standard size doors instead of ordering fully custom products whenever possible. With the right adjustments, standard doors can fit a wide variety of openings while delivering significant cost and scheduling benefits.

What Is a Standard Door Size?

In commercial construction, door sizes are standardized to simplify manufacturing, installation, and replacement. Both metal and wood doors typically come in a 1-3/4” thickness and are produced in a range of common dimensions.

Standard Commercial Door Width Options

• 2'0" (24")
• 2'6" (30")
• 2'8" (32")
• 3'0" (36") - the most popular standard commercial door width
• 3'4" (40")
• 3'6" (42")
• 3'8" (44")
• 4'0" (48")

Average Commercial Door Height Options

• 6'8" (80") - great for older buildings
• 7'0" (84") -

When planning a project, one of the most common questions is where to buy commercial wood doors that deliver both performance and style. The answer matters because the right partner can make your project smoother, safer, and more cost effective. CDF Doors stands out as a trusted commercial wood door supplier that delivers quality products, expert support, and reliable results for a wide range of applications.

A Trusted Commercial Wood Door Supplier

CDF Doors has built a strong reputation as a go-to source for commercial interior wood doors. From offices and schools to hotels and healthcare facilities, their doors are designed to meet the demands of high traffic environments. Each door is crafted with durability in mind while still offering the warmth and natural look that wood brings to interior spaces.

Unlike many suppliers, CDF offers full door assemblies, not just door slabs. This means you get a complete, ready to install solution that helps reduce delays and ensures everything works

Buying commercial doors isn’t something most people do every day.

And if you’re sourcing doors for a new project, replacement opening, facility upgrade, or tenant buildout, there’s a good chance you’ve already run into questions like:

• Where do you actually buy commercial doors?

• What’s the difference between a supplier and a manufacturer?

• How do you know you’re ordering the right product?

The good news is that buying commercial doors is usually much easier than it first seems — especially when you’re working with the right commercial door supplier.

When searching for where to buy commercial doors, you’ll typically come across manufacturers, distributors, and online suppliers. Some companies only manufacture specific products, while others distribute products from multiple brands and product lines.

For many buyers, working with a commercial door distributor offers more flexibility because it allows you to compare multiple door types, frame options, hardware configurations, and accessories

When planning a building upgrade, commercial interior doors are often overlooked, but they are one of the most impactful ways to improve an existing space.

This is not because you are starting from scratch, but because you are working within what already exists and trying to enhance performance, aesthetics, compliance, and tenant experience without a full rebuild.

At first glance, the decision may seem simple: glass, wood, or metal. In renovation projects, especially in occupied or aging buildings, it becomes far more strategic.

Interior office doors do more than separate spaces. They influence privacy, acoustics, durability, safety compliance, visibility, and even how modern a space feels.

So instead of asking, “What door should I pick?”, the better question is:

What issue in my building am I trying to solve, and which door solution helps me fix it most effectively?

When you see terms like steel building doors, commercial fire rated doors, or hurricane proof doors, you’re not just looking at product categories—you’re looking at solutions built for specific risks, codes, and environments.

That’s what defines a specialty door.

At CDF Distributors, specialty doors are designed around real-world performance, not just standard sizing or appearance. Each type exists to solve a specific problem that a typical door cannot.

What Are Specialty Doors?

Specialty doors are engineered for performance requirements beyond standard use. In commercial construction, doors are often part of a larger system tied to safety, compliance, and long-term durability. A standard door might close an opening, but a specialty door is designed to perform under pressure—literally and figuratively.

You’ll typically see specialty doors used when a project calls for:

• Preassembled metal building doors (commonly referred to as steel building doors) for exterior commercial structures

When you’re ordering commercial double doors or exterior steel double doors, the last thing you want is a damaged shipment slowing down your project. At CDF Distributors, we understand that these doors aren’t just pieces of steel—they’re investments in safety, security, and smooth daily operations. That’s especially true for fire rated double doors, where performance matters from day one. That’s why we take extra care every step of the way, from production to shipping. 

Fast-Track Production with Care Built In 

Every door that leaves our facility goes through a carefully designed process. Here is what sets our doors apart.  

• Precision Manufacturing: Doors are built to spec with tight tolerances, ensuring they fit perfectly on arrival. 

• Quality Checks: Each door is inspected for alignment, finish, and hardware placement—so there’s no last-minute surprises on site.  

• Protective Packaging: Heavy-duty wrapping, custom crating, and careful pallet placement mean your commercial double doors

Choosing the correct door handing, also called door swing, is a critical part of specifying fire rated double doors. Door handing affects how the doors operate, how hardware is applied, and whether the opening meets fire and life safety requirements. For commercial double doors, including exterior steel double doors and interior fire-rated openings, understanding handing helps avoid installation errors, inspection failures, and costly rework.

Whether you are specifying a double door fire rated opening for a corridor, stairwell, or exterior wall, door handing must work in coordination with fire-rated hardware. Below is a clear breakdown of the most common handing options used for a double fire door and how each functions.

Types of Door Handing for Fire Rated Double Doors

Left-Hand Active

In a left-hand active configuration, the left leaf is the primary operating door. It contains the latch and opens first during normal use. The right leaf is typically the inactive door secured with vertical