ドアの開き方の種類に関する究極のメーカーガイド：ドアの開き方を判断する方法

導入

Have you ever bought an expensive smart lock or a custom wooden door, only to realize on installation day that it doesn’t fit because the orientation is wrong? When shopping for hardware, suppliers inevitably ask if you need an LH, RH, inswing, or outswing door. Guessing can lead to frustrating returns or ruined custom materials. Don’t panic! This guide provides a practical, easy-to-understand method for determining door handing. Whether you are a homeowner at a hardware store or a designer drafting a floor plan, this quick guide will ensure you buy the correct hardware and design the perfect spatial flow.

What is Door Handing?

In the construction and hardware industry, Door Swing Types specifically refers to the Handing of a hinged door. It dictates which side the hinges are installed on and whether the door pushes away from you or pulls toward you.

Quick Tip: We are not talking about sliding or folding doors here, but standard swinging doors that operate on side hinges.

The 4-Step Golden Rule of Door Handing

Never stand inside the room and guess! There is only one universally accepted standard for determining door handing:

1. Stand on the Outside: Position yourself on the 外観 of the door (e.g., in the hallway, outside the house, or the side where you insert the key/fingerprint).
2. Face the Door: Stand squarely facing the door slab.
3. Locate the Hinges: Notice whether the hinges are on the left or the right side of the door frame.
4. Determine the Motion: Observe whether the door pulls toward you or pushes away from you.

The 4 Standard Door Handings Explained

Using the Golden Rule above, let’s break down the 4 standard door handing types in the hardware world:

(Note: We highly recommend taking a screenshot of these 4 basic types to keep on your phone before buying hardware.)

1. Left Hand (LH)

• 位置： Standing outside, the hinges are on your 左.
• アクション： The door pushes inward, away from you.
• Memory Trick: You would naturally use your left hand to push it open.

2. Right Hand (RH)

• 位置： Standing outside, the hinges are on your 右.
• アクション： The door pushes inward, away from you.
• Memory Trick: You would naturally use your right hand to push it open.

3. Left Hand Reverse (LHR)

• 位置： Standing outside, the hinges are on your 左.
• アクション： The door pulls outward, toward you.
• Memory Trick: The word “Reverse” typically means an outswing door. Hinges on the left, pulling out.

4. Right Hand Reverse (RHR)

• 位置： Standing outside, the hinges are on your 右.
• アクション： The door pulls outward, toward you.
• Memory Trick: Hinges on the right, pulling out.

How to Determine Handing for Double Doors

When dealing with double doors, you might wonder how to determine handing when there are hinges on 両方 the left and the right. The hardware industry solves this by dividing the doors into two roles: the Active Leaf そして Inactive Leaf.

• The Active Leaf: This is the primary door you use every day. It houses the main functional hardware (the working doorknob, lockset, and latch).
• The Inactive / Passive Leaf: This door remains closed most of the time, secured by flush bolts at the top and bottom. It typically features “dummy” hardware (handles that look real but don’t turn) and an astragal (the vertical molding that seals the gap between the two doors).

The Rule for Double Doors:

To determine the handing of a double door system, you only evaluate the Active Leaf using the exact same Golden Rule. Ignore the inactive leaf entirely.

• 例： Stand on the outside. If the Active Leaf is on your right side, and you have to push it inward to open it, you are ordering a Right Hand (RH) Active double door.

Commercial Exceptions for Double Doors:

If you are working on commercial spaces, you might also encounter two specialized double door setups that break standard handing rules:

• Double-Acting Doors: Think of busy restaurant kitchen doors or saloon doors. They use specialized spring or pivot hinges to swing 両方 inward and outward. They do not have standard LH or RH designations.
• Double Egress Doors: Common in hospital or school corridors. In this setup, the two leaves swing in opposite directions. This is designed to control heavy, two-way foot traffic and meet strict fire code regulations.

Buyer’s Guide: Tips for Locks and Pre-hung Doors

Now that you understand the theory, how do you apply this when actually spending money?

Hardware Buying: The Reversible Solution

Many modern door locks and handles are Universal or Reversible.

• 注目すべき点: Check the product details or packaging for the word Reversible. If it’s there, it means you can flip the latch orientation yourself. You don’t need to worry about LH or RH—just buy it!
• If you must choose: Imagine you are holding your keys, ready to open the door to go home. If your right hand grabs the handle and pushes inward, it’s an RH. If your left hand grabs it and pushes inward, it’s an LH.

The Communication Template for Pre-hung Doors

If you are ordering a pre-hung door (a door already attached to its frame), the factory needs to pre-cut the hinge mortises and lock bores. Copy and paste this exact phrasing to your supplier to ensure zero misunderstandings:

“I need a [Size, e.g., 32″ x 80”] interior door, [LH/RH/LHR/RHR] swing, standard bore.”

Space Planning: Room-by-Room Best Practices

Which way a door opens directly impacts how comfortable and safe a home is. Excellent traffic flow design makes a space feel larger and prevents daily collisions.

Use this room-by-room cheat sheet when planning floor plans or buying materials:

Regional Rules: How Weather and Codes Dictate Door Handing

As a professional door and window manufacturer dealing with global projects, we’ve found that door swings aren’t universally the same. They are deeply influenced by climate, culture, and local building codes:

• Hurricane Zones (Focus on Wind Load): In Florida and coastal areas prone to typhoons, exterior doors are strictly required to be Outswing (Reverse). Positive wind pressure pushes an outswing door tighter against its frame. The same wind pressure could blow an inswing door right off its locks.
• Heavy Snow Regions (Focus on Entrapment): In northern climates with heavy snowfall, exterior doors absolutely must be インスイング. An outswing door can easily become blocked by a 3-foot snowdrift, trapping the occupants inside during an emergency.
• Asian Culture & Feng Shui (Focus on “Welcoming Energy”): In traditional Asian Feng Shui, the main entry door should “welcome” guests and good fortune. Therefore, the vast majority of residential doors are インスイング, symbolizing bringing wealth into the home.
• Nordic Eco-Friendly Builds (Focus on Insulation): In countries like Sweden and Norway, maximizing indoor warmth and entryway space is key. They heavily favor outswing residential doors, which save valuable foyer space and utilize weatherstripping effectively against cold winds.

Advanced: Commercial Codes and Floor Plan Basics

For professionals and commercial spaces, door handing isn’t just about user experience—it’s a matter of law and compliance.

When is an Outswing (Reverse) Door Mandatory?

Fire & Life Safety Codes: The International Building Code (IBC) generally dictates that rooms with an occupancy load of 50 or more people must have doors that swing outward in the direction of egress travel (Outswing). This prevents a panicked crowd from crushing against an inswing door and trapping themselves inside.

Reading Door Symbols on Floor Plans

On CAD floor plans, a door is drawn as a straight line with a “quarter-circle arc.” This arc represents the door’s swing trajectory. The area swept by this arc is the clearance area—a strict no-go zone where fixed furniture or cabinetry cannot be placed.

Extended Reading: 5 Basic Door Operation Types

If you are still debating what type of door mechanism best fits your space, check out this quick comparison:

Related Reading:

The Classic Swinging Door Upgrade Thinking about upgrading your standard hinged doors? French doors are the ultimate double-door solution that instantly elevates any space. Before you buy, check out our comprehensive guide: フレンチドアの種類：2026年版購入ガイドと注意点 to ensure you make the right choice for your home.

よくある質問（FAQ）

Q: Do refrigerator or appliance doors follow these same handing rules?

A: Actually, no! Appliance handing (like fridges or microwaves) is usually determined simply by where the hinges are located when facing the appliance. If hinges are on the right, it’s a right-hinged door. You don’t apply the “push/pull” architectural rule because you can’t stand “inside” a fridge.

Q: Do all interior door locks require me to choose handing?

A: No. Standard round doorknobs are generally universal. However, doors with lever handles usually require you to select a specific handing unless the product explicitly states it is a “reversible” lever.

Q: My door frame doesn’t have hinges installed yet. How do I decide between LH or RH?

A: Stand in the hallway and look at the doorway. Consider two things: First, when opened, the door should rest flat against a wall, not protrude into the middle of the room. Second, the first thing you see when pushing the door open should be the widest and most attractive angle of the room. Decide where the door needs to go based on these two points, then reverse-engineer whether you need an LH or RH.

結論

Determining your door swing type isn’t complicated. Just remember the core mantra: “Stand outside, locate the hinges, push or pull.” By following the Golden Rule, whether you are doing a single room remodel or a massive procurement run, you can say goodbye to the headache of buying the wrong hardware.

Expert Tip & Custom Solutions from Hotian Windows

Whether you are stressing over a residential build or seeking a reliable supply chain for a large-scale commercial development, accurate communication is the foundation of success. As an industry-leading door and window manufacturer, ホティアンウィンドウズ is ready to provide custom, end-to-end solutions for your projects—from blueprint breakdowns and precise door handing schedules to mass production.

If you have any questions or require specialized procurement for a commercial project, let our team of customization experts eliminate the guesswork. Visit us at ホームページ today to discuss your floor plans and get your exclusive project quote!