Door Size Codes 2/8, 3/0, 6/8: B2B Dimensions & Picture Guide

Understanding Door Size Codes: What 2/8, 3/0, and 6/8 Actually Mean

A door size code expresses width and height in feet and inches, written as width/height. A 2/8 door is 2 feet 8 inches wide and 8 feet (96 inches) tall — a 32-inch by 96-inch slab. A 3/0 door is 3 feet 0 inches wide (36 inches), and a 6/8 door is 6 feet 8 inches tall (80 inches). The number before the slash is always width; the number after is always height.

This shorthand exists because architects, estimators, and door schedules need a fast, unambiguous way to communicate size without writing “32 in. × 96 in.” on every line. Once you can read the code, a door schedule becomes a compact specification document rather than a puzzle.

Reading the Code Correctly

The format follows a simple rule: feet on the left, feet on the right, inches appended after each foot value. So:

• 2/8 = 2 ft 8 in wide × 8 ft 0 in high
• 3/0 = 3 ft 0 in wide × 0 ft 0 in — wait, this is incomplete. In practice, 3/0 always appears with a height code, such as 3/0 × 6/8, meaning 36 in wide × 80 in high.
• 6/8 alone usually refers to height only, and is almost always paired with a width code.

The critical point: a single code like “3/0” is only half a specification. A complete door callout is written as width/height — for example, 3/0 × 6/8, or 2/8 × 6/8.

What Is a 2/8 Door?

A 2/8 door is 32 inches wide and, when paired with a 6/8 height, 80 inches tall. This is one of the most common single-door widths in commercial and residential construction because 32 inches provides a comfortable clear opening for foot traffic while fitting standard 34-inch rough openings. A 2/8 door is frequently specified for bathrooms, offices, and secondary entrances.

What Is a 2 8 Door?

“What is a 2 8 door” and “what is a 2/8 door” are the same question asked two ways. The space or slash is just notation — the dimensions are identical: 32 inches wide. The height depends on the second code. A 2/8 × 6/8 door is 32 in × 80 in; a 2/8 × 8/0 door is 32 in × 96 in.

Decoding 6/6 and 9/0 Heights

A 6/6 door is 6 feet 6 inches tall — 78 inches. This was the standard residential height for decades and still appears in older buildings and renovation projects. Modern construction has largely shifted to 6/8 (80 inches) and 8/0 (96 inches) for taller openings. A “door 9” reference in a schedule typically means a 9-foot-wide opening, often a sliding or stacking configuration rather than a single swing door.

Figure 1 — Door dimension reference diagram. Alt text: picture of a door showing width and height measurement points, including a 2/8 door and 3/0 door with dimension lines.

Standard Door Dimensions: A Precise Inch-by-Inch Reference Table

Door dimensions in North American and many export markets are nominal — the listed size refers to the door slab or the frame opening, and the two are not the same. A 2/8 door slab is 32 inches wide, but the rough opening required to install it is typically 34 inches wide and 82 inches tall for a 6/8 height. Buyers who confuse slab size with rough opening size create costly framing errors.

The table above gives the common nominal widths. The table below adds the rough-opening figures that matter for procurement and site coordination.

Two practical notes. First, rough-opening dimensions vary by frame type — a pre-hung unit in a steel frame may need less clearance than a wood frame with a sill. Second, always confirm whether the supplier quotes slab dimensions or frame dimensions; in export documentation, this distinction is a frequent source of disputes.

Metric Conversion for Export Buyers

For buyers working in metric markets, the conversions are:

• 2/4 = 711 mm wide
• 2/6 = 762 mm wide
• 2/8 = 813 mm wide
• 3/0 = 914 mm wide
• 6/8 = 2032 mm high
• 8/0 = 2438 mm high

These are nominal figures. Actual manufactured dimensions may vary by a few millimeters depending on the profile system and local standards.

Visual Guide to Door Types: Outswing, Fixed, Stacking, and Exterior 15-Lite

A picture of a door communicates its operation type, swing direction, and glazing pattern faster than any written description. For procurement, the ability to read a door photo or elevation drawing is a core skill — it prevents ordering a left-hand inswing when the opening requires a right-hand outswing.

How to Identify Door Types from a Picture

Start with the hinge side and the swing arc. In an elevation or plan drawing, the swing arc shows which way the door opens. In a photograph, look for the hinge barrels — they are visible on the side where the door pivots.

• Outswing doors open away from the viewer or the interior space. They are common on exterior entries in coastal and high-wind regions because the door is pushed against the frame by wind pressure rather than pulled away from it. Outswing doors also save interior floor space.
• Fixed doors do not swing at all. A fixed door panel is essentially a glazed or solid panel set in a frame — it looks like a door but functions as a window or wall. In door schedules, these are often marked “fixed” or “FX.” They are used in storefronts, curtain walls, and sidelight configurations.
• Stacking doors consist of multiple panels that slide and stack against one another, typically at one or both ends of an opening. When fully open, they create a wide, unobstructed passage — common in restaurants, patios, and sunrooms. A “door 9” in a schedule may refer to a 9-foot-wide stacking opening.
• Sliding doors move horizontally along a track without stacking. They are distinct from stacking doors in that the panels remain in the same plane.

What Is an Exterior 15-Lite Door?

An exterior 15-lite door has 15 individual glass panes (lites) arranged in a grid — typically three columns by five rows — set into an exterior door slab. The term “lite” is the industry word for a single glazed unit within a door or window. A 15-lite door is most often used as a primary or secondary exterior entry where daylight transmission is a priority: front entries, patio doors, and porch entries. Because it is an exterior door, it must meet the applicable building code for the project’s jurisdiction — including energy performance, wind resistance, and in some cases safety glazing requirements for the glass.

Reading Glazing Patterns in Photos

When evaluating a door stock photo or supplier image, count the lites and note the grid pattern. A 15-lite door is not the same as a 15-pane door if the panes are divided by muntins versus a true divided lite. In export catalogs, this distinction affects both appearance and cost.

Door Finishes and Patterns: From Dark Brown to Special Custom Designs

Finish and pattern are the two visual variables that most affect how a door reads in a photograph and how it performs in service. For B2B procurement, they are specification items, not decoration.

Door Dark Brown and Other Standard Finishes

A door dark brown finish is one of the most widely specified exterior colors because it hides handling marks, resists showing dirt, and coordinates with brick, stone, and timber facades. In aluminum systems, dark brown is typically a powder-coat or anodized finish; in wood doors, it is a stain and topcoat. The finish specification should always state the substrate, the coating system, and the warranty exposure — not just the color name.

Door Patterns and Special Door Configurations

Door patterns describe the arrangement of panels, lites, and rails. Common patterns include:

• Full-lite — a single glass panel occupying most of the door
• Half-lite — glass in the upper half, solid panel below
• 15-lite — a 3 × 5 grid of glass panes
• Panel patterns — raised or recessed panels in 2-panel, 3-panel, or 6-panel arrangements

A special door is any door that falls outside standard catalog sizes or patterns — oversized slabs, non-standard swing configurations, or custom glazing layouts. Special doors require a shop drawing and a confirmed template before production; ordering them from a stock photo alone is a common and expensive mistake.

Applying Door Specifications in Real Procurement Scenarios

Size codes and visual identification matter most when they are applied to a specific opening. The following scenarios show how the pieces fit together.

Scenario 1: Commercial Office Fit-Out

A tenant improvement project specifies 3/0 × 6/8 doors for offices and 2/8 × 6/8 for storage rooms. The door schedule lists swing direction and hardware. The buyer must confirm: slab or frame dimensions? Fire rating required? Does the 3/0 width meet the accessible route clear-width requirement after the door stop and hardware are installed? A 3/0 door provides a 36-inch nominal opening, but the actual clear width is reduced by the frame and the door thickness when open — typically to about 32–34 inches. This is why 3/0 is the minimum width generally used on accessible routes.

Scenario 2: Residential Villa with Stacking Doors

A villa project specifies a 9-foot-wide stacking door opening to a terrace, plus a 15-lite exterior door at the main entry. The buyer needs to coordinate: the stacking door’s track and pocket depth, the sill height, and the exterior door’s wind-load rating for the project’s location. These are not interchangeable products — a stacking door is a system with a frame, track, and multiple panels, while the 15-lite door is a single slab.

Scenario 3: Renovation with Existing 6/6 Openings

A renovation project has existing 6/6 (78-inch) door openings. Standard 6/8 (80-inch) doors will not fit without modifying the header. The buyer must either source 6/6 doors or plan for framing changes. This is a case where reading the existing door height code correctly saves a change order.

How to Use Door Stock Photos and Pictures for Specification

A door stock photo is useful for communicating intent, but it is not a specification. When using images in a submittal or inquiry:

• Confirm the image shows the correct swing direction and handing
• Note whether the photo shows a slab only or a complete pre-hung unit
• Check the glazing pattern against the written spec
• Ask the supplier for a dimensioned elevation, not just a photograph

A dimensioned drawing with a picture of a door attached is the most reliable way to avoid misinterpretation between buyer and manufacturer.

Key Factors in Specifying Doors for B2B Projects

Every door specification should resolve these variables before an order is placed:

Common Questions About Door Sizes and Configurations

What is a 2/8 door and what are its dimensions?
A 2/8 door is 32 inches wide. Paired with a 6/8 height code, it is 32 in × 80 in. It is one of the most common single-door widths for offices, bathrooms, and secondary entries.

What is a 2 8 door and how does it differ from other sizes?
A 2 8 door is the same as a 2/8 door — 32 inches wide. The notation differs, the dimensions do not. It differs from a 2/6 (30 in) and a 3/0 (36 in) in width, which affects both the rough opening and the clear passage width.

What do 3/0, 6/8, and 6/6 door codes mean?
3/0 is 36 inches wide. 6/8 is 80 inches high. 6/6 is 78 inches high. A complete callout combines width and height, such as 3/0 × 6/8.

What is the difference between outswing doors and fixed doors?
Outswing doors open away from the interior and are hinged on one side. Fixed doors do not open at all — they are glazed or solid panels set in a frame and function as windows or wall sections.

How can I identify door types from a picture of a door?
Look at the hinge side, the swing arc, and the number of panels. Stacking and sliding doors show multiple panels in a track; fixed doors show no hinges or swing arc; outswing doors show hinges on the exterior face.

What is an exterior 15 lite door and where is it used?
It is an exterior door with 15 glass panes in a grid, used at entries and patio openings where daylight transmission matters. It must meet the project’s exterior door code requirements, including wind and energy performance.

What are common door patterns and finishes like dark brown?
Common patterns include full-lite, half-lite, 15-lite, and 2-, 3-, or 6-panel. Dark brown is a widely specified exterior finish because it hides handling marks and coordinates with masonry and timber facades.

How do I specify the right door size for a B2B project?
Start from the rough opening and the required clear width, confirm the swing and operation type, then select the nominal size code that fits. Always confirm slab versus frame dimensions with the supplier before ordering.

Related Considerations for Door Selection and Sourcing

A few practical points that come up repeatedly in B2B door procurement:

• Outswing doors are often required in high-wind zones, but they need exterior hardware and a different threshold detail than inswing units.
• Fixed doors are frequently mistaken for operable doors in photographs. If a schedule item is marked fixed, it is a glazed panel, not a swing unit.
• Stacking doors and sliding doors are different systems. Stacking panels collect at one or both ends; sliding panels remain in the same plane.
• A huge door — anything over 8/0 in height or 3/6 in width — usually requires a custom shop drawing and may need structural reinforcement at the header.
• Your door specification should always state whether dimensions are slab or frame; this single clarification prevents most order errors.
• Door 9 in a schedule commonly means a 9-foot-wide opening, which is usually a stacking or multi-panel configuration.
• E doors and electronic access systems are outside the scope of a dimensional specification — they are hardware and controls packages that are specified separately.

In short: a door is a movable barrier defined by its width and height dimensions, expressed either in feet and inches or as nominal codes such as 2/8, 3/0, and 6/8. Its full specification also includes swing direction (inswing or outswing), operation type (fixed, stacking, sliding, casement), material, finish such as dark brown, and glazing pattern such as a 15-lite exterior door. Reading these attributes from a picture of a door requires checking the hinge side, swing arc, panel count, and lite grid. Together, the size code and the visual attributes form the complete procurement specification for any door opening.

As a manufacturer, our approach to this is straightforward: we build to the size code and configuration the project requires, and we confirm slab versus frame dimensions, swing handing, glazing pattern, and finish before production. Our profile structures and fittings can be adjusted to match the building codes of the target market, and we carry out air-tightness, water-tightness, and wind-resistance testing before shipment. We supply FCL and LCL shipments directly from our factory, with packing lists, proforma invoices, and full customs documentation. If you are working from a door schedule or a picture of a door and need a quote against your specification, Talk to Our Team.

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