Selecting a commercial door closer requires matching three variables: the ANSI/BHMA closer size (1 through 6) to the door’s width and weight, the arm type to the frame and mounting condition, and the functional features (backcheck, delayed action, hold-open) to the building’s accessibility and fire-safety requirements. Getting any one of these wrong results in a closer that either cannot control the door or fails prematurely. This reference guide covers the selection criteria that commercial contractors, facility managers, and specifiers need to size and specify surface-mounted door closers for standard commercial openings.
CDF Distributors supplies commercial door closers as part of complete door and frame assemblies. You can configure and order assemblies online using CDF’s ProBuilder tool at cdfdistributors.com. For assistance selecting a closer for your project, call (855) 769-9895 or email sales@cdfdoors.com.
What Is a Commercial Door Closer?
A commercial door closer is a mechanical device mounted on or within a door and frame assembly that controls the speed and force with which the door closes after being opened. Door closers serve three functions: they return the door to the closed position automatically, they control the speed of the closing cycle to prevent slamming, and they latch the door securely into the frame. In fire-rated openings, the closer is a required component of the assembly and must carry a listing that matches the door and frame ratings.
Surface-mounted closers are the most common type in commercial construction. They mount on the face of the door or frame and use a hydraulic cylinder with an adjustable spring to control the door’s movement. Concealed closers (overhead concealed and floor closers) are also available but are outside the scope of this guide.
ANSI/BHMA Closer Sizes (1 Through 6)
The ANSI/BHMA standard defines six closer sizes based on the spring force required to close the door. Each size corresponds to a range of door widths and weights. Selecting the correct size ensures the closer generates enough force to latch the door without exceeding ADA opening-force limits. The following table summarizes the standard closer sizes, their corresponding door dimensions, and typical applications.
Closer Size | Door Width | Door Weight (Approx.) | Typical Application |
Size 1 | Up to 27” | Up to 75 lbs | Interior residential, light-duty storage |
Size 2 | 27” to 30” | 75 to 100 lbs | Interior office doors, restrooms |
Size 3 | 30” to 36” | 100 to 150 lbs | Standard interior commercial doors |
Size 4 | 36” to 42” | 150 to 200 lbs | Standard exterior doors, high-traffic interior |
Size 5 | 42” to 48” | 200 to 250 lbs | Wide exterior doors, heavy doors |
Size 6 | 48” and wider | 250 lbs and above | Oversized openings, heavy exterior doors |
Most standard commercial interior doors (3’0” x 7’0”) require a size 3 or size 4 closer. Exterior doors and doors exposed to wind load or high traffic generally require a size 4 or larger. Many commercial closers are adjustable across a range of sizes (for example, size 1–6 or size 3–6), allowing the installer to tune the spring power to the specific door after installation.
Size adjustability does not eliminate the need for correct initial sizing. A closer adjusted to its maximum spring setting to compensate for undersizing will exceed ADA opening-force limits and wear out the hydraulic mechanism prematurely.
Door Closer Arm Types
The arm type determines how the closer body and arm assembly mount relative to the door and frame. The three standard arm configurations for surface-mounted closers are regular arm (standard arm), parallel arm, and top jamb mount. Each has distinct mounting geometry, projection depth, and aesthetic characteristics. The following sections describe each type and when to use it.
Regular Arm (Standard Arm)
In a regular arm installation, the closer body mounts on the pull side (the side the door opens toward) of the door, and the arm shoe mounts on the frame head. The arm extends from the closer body to the frame in a straight or slightly angled line. Regular arm is the most common and most efficient arm type because it uses the full mechanical advantage of the closer’s spring. It provides the highest closing force per closer size and is the default configuration unless site conditions require otherwise.
Limitation: The closer body is visible on the pull side of the door and projects from the door face. In corridors or other applications where the door opens into a public space, this projection may be an aesthetic concern or may reduce clear opening width.
Side-view diagram showing closer body on pull side of door face, arm extending to shoe mounted on frame head. Label closer body, arm, shoe, pull side, push side. This diagram requires CDF approval before inclusion in the production file.
Parallel Arm
In a parallel arm installation, the closer body mounts on the push side (the side the door opens away from) of the door, and a bracket mounts on the soffit (underside) of the frame head. The arm runs parallel to the door face when the door is closed, resulting in a lower profile. Parallel arm is the standard configuration for corridor applications and is required by many architectural specifications because it keeps the closer hardware on the non-public side of the door.
Parallel arm mounting reduces the effective closing force by approximately 20 to 25 percent compared to regular arm on the same closer body. This means a closer that provides size 4 force in regular arm configuration may only deliver size 3 force in parallel arm. Always verify the closer’s size rating for the specific arm type being used.
Side-view diagram showing closer body on push side of door face, arm running parallel to door when closed, bracket on frame soffit. Label closer body, arm, bracket, push side, pull side. This diagram requires CDF approval before inclusion in the production file.
Top Jamb Mount
In a top jamb installation, the closer body mounts on the frame head (the top of the frame) rather than on the door face, and the arm connects down to a shoe on the door. Top jamb mounting is used when the door has a very narrow top rail that cannot support a closer body, or on doors with glass panels extending close to the top edge. It is also used on some double-acting and specialty door applications.
Top jamb mounting reduces closing force compared to regular arm and may require a larger closer size to achieve the same latching performance. It is less common than regular arm or parallel arm in standard commercial openings.
Side-view diagram showing closer body on frame head, arm extending down to shoe on door top rail. Label closer body, arm, shoe, frame head. This diagram requires CDF approval before inclusion in the production file.
Arm Type Comparison
The following table compares the three standard arm types across key selection criteria including mounting location, closing efficiency, and common applications.
Criteria | Regular Arm | Parallel Arm | Top Jamb |
Closer Body Location | Pull side of door | Push side of door | Frame head |
Arm/Bracket Location | Frame head | Frame soffit | Door top rail |
Closing Efficiency | Highest (100%) | Reduced (~75–80%) | Reduced |
Projection from Door | Higher | Lower | Minimal on door |
Corridor Use | Less common | Standard | Situational |
Fire-Rated Openings | Yes | Yes | Verify with listing |
Door Closer Functions and Adjustments
Commercial door closers include hydraulic valves that control the door’s behavior during different phases of the closing cycle. Understanding these functions is necessary for proper specification and on-site adjustment. The following sections cover the standard adjustable functions found on most commercial surface-mounted closers.
Closing Speed (Sweep Speed)
The closing speed valve controls the rate at which the door moves from the fully open position to approximately 15 degrees from closed. This is the main portion of the closing arc. Adjusting closing speed does not change the spring force; it controls how quickly the hydraulic fluid moves through the valve. A faster setting moves the door more quickly, while a slower setting provides a more controlled close. Most specifications call for a full close cycle of 5 to 8 seconds from 90 degrees open to the latched position.
Latching Speed
The latching speed valve controls the door’s speed during the final 15 degrees of closing, where the latch must engage the strike. This valve is set independently from the closing speed. The latching speed must be fast enough to push the latch bolt into the strike plate but slow enough to avoid slamming. An improperly set latching speed is one of the most common causes of doors that fail to latch or that slam shut.
Backcheck
Backcheck is a hydraulic function that resists the door from being thrown open beyond a certain point (typically around 70 to 85 degrees, depending on the closer). When someone pushes a door open forcefully, the backcheck valve creates hydraulic resistance that slows and cushions the opening motion. This protects the door, frame, wall, and closer from impact damage. Backcheck is especially important in high-traffic areas such as schools, hospitals, and retail entrances where doors are frequently pushed open with force.
Backcheck is a standard feature on most commercial-grade closers. It is not a door stop and does not replace a wall-mounted or floor-mounted door stop. Backcheck only slows the opening force; it does not lock the door at a set angle.
Delayed Action
Delayed action is an optional function that holds the door open for a set period (typically 10 to 60 seconds, depending on the closer model) before the closing cycle begins. When the door is opened past approximately 70 to 80 degrees, the delayed action valve holds the door in the open position for the set time before releasing it to close at the normal sweep and latching speeds.
Delayed action is commonly specified for healthcare facilities, buildings with high cart or equipment traffic, and openings serving users who need additional time to pass through the doorway. Delayed action is a separate function from hold-open and does not require manual release. The door closes automatically after the delay period expires.
Delayed action closers must not be used on fire-rated openings unless the closer is specifically listed for fire-rated use with delayed action. Fire-rated openings require the door to close and latch automatically when released.
Hold-Open
Some closers include a mechanical or friction hold-open feature that keeps the door at a set angle (typically 85 to 110 degrees) until manually released. Hold-open closers are used where the door needs to remain open during business hours or high-traffic periods and close automatically when released.
Hold-open closers are prohibited on fire-rated openings unless the hold-open mechanism is connected to the building’s fire alarm system and releases automatically upon alarm. Electromagnetic hold-open devices connected to the fire alarm are a separate product category and are not built into the closer itself.
ADA Opening Force Requirements
The Americans with Disabilities Act Accessibility Guidelines (ADAAG) and ICC A117.1 set maximum opening force limits for doors in accessible routes. These requirements directly affect closer selection because the closer’s spring tension determines how much force is needed to push or pull the door open. The following table summarizes the maximum allowable opening forces.
Door Type | Maximum Opening Force | Reference |
Interior hinged doors (non-fire-rated) | 5 lbf (22 N) | ADAAG 4.13.11 / ICC A117.1 |
Exterior hinged doors | 15 lbf (67 N) | Local codes vary; 15 lbf is common threshold |
Fire-rated doors | 15 lbf (67 N) | NFPA 80; AHJ may permit up to 15 lbf |
Sliding or folding doors | 5 lbf (22 N) | ADAAG 4.13.11 |
The 5 lbf maximum for interior doors is the most restrictive requirement and is the primary reason closer sizing is critical. A closer that is oversized for the door will require more than 5 lbf to open, creating an ADA compliance failure. A closer that is undersized will not generate enough force to latch the door reliably.
Fire-rated doors present a specific challenge because the closer must generate enough force to fully latch the door (a fire code requirement) while remaining within the maximum opening force permitted by accessibility standards. On interior fire-rated doors, the AHJ may permit up to 15 lbf to ensure positive latching, but this should be confirmed on a project-by-project basis.
Opening force is measured at the latch edge of the door with a push-pull gauge. The measurement is taken with the latch retracted so that only the closer’s resistance is measured, not the friction of the latch bolt against the strike.
ANSI/BHMA Closer Grades
ANSI/BHMA A156.4 defines three grades for surface-mounted door closers based on cycle testing, closing force consistency, and durability. The grade determines the closer’s expected service life and suitability for different traffic levels. The following table summarizes the three grades.
Grade | Cycle Test Requirement | Typical Application |
Grade 1 | 10,000,000 cycles (with continued performance) | High-traffic commercial: hospitals, schools, airports, retail entrances, government buildings |
Grade 2 | 2,000,000 cycles | Medium-traffic commercial: offices, conference rooms, interior corridors |
Grade 3 | 500,000 cycles | Light-traffic commercial and residential: storage rooms, private offices, residential entries |
Grade 1 closers are required by most commercial specifications and are the standard for openings with high cycle counts, exterior exposure, or fire-rated assemblies. Grade 2 closers are acceptable for interior office environments with moderate traffic. Grade 3 closers are generally limited to residential or very low-traffic commercial applications.
The grade also affects the closer’s ability to maintain consistent closing force over time. Grade 1 closers must demonstrate minimal degradation in spring force and valve performance after the full cycle test. Lower-grade closers may experience more noticeable changes in closing speed and force as they age.
Door Closers in Fire-Rated Openings
Fire-rated door assemblies require a self-closing device that returns the door to the fully closed and latched position automatically. The closer must be listed and labeled for the specific fire rating of the assembly. Fire rating levels for commercial door assemblies include the following five classifications.
Fire Rating | Duration | Typical Wall Rating | Common Application |
20-minute | 20 min | 1-hour wall | Corridor doors, room separations |
45-minute | 45 min | 1-hour wall | Corridor doors, office separations |
60-minute (1-hour) | 60 min | 1-hour or 2-hour wall | Stairwell doors, exit enclosures |
90-minute (1½-hour) | 90 min | 2-hour wall | Stairwell enclosures, high-hazard separations |
180-minute (3-hour) | 180 min | 3-hour or 4-hour wall | Fire walls, occupancy separations (masonry frames only) |
For fire-rated openings, the closer must meet the following requirements:
- The closer must carry a listing from a nationally recognized testing laboratory (such as UL or Intertek/WHI) for the fire rating of the assembly.
- The closer must close and positively latch the door from any open position. Hold-open features are prohibited unless connected to the fire alarm system for automatic release.
- The closing speed must be set so the door fully closes within the time required by NFPA 80 (typically the door should start closing within 10 seconds of release and take no more than 30 seconds to fully close from the 90-degree position).
- Delayed action functions must be specifically listed for the fire rating if used.
- All fire-rated assembly components (door, frame, closer, hinges, latch/lockset, glass, louvers) must be listed as compatible. Substituting an unlisted closer voids the assembly rating.
How to Select a Door Closer: Decision Process
Selecting the correct door closer involves evaluating the door, the frame, the opening conditions, and the applicable code requirements. The following sequence covers the key decisions in order of priority.
Determine the Required Closer Size
Start with the door’s width and weight. Use the ANSI/BHMA size table earlier in this guide to identify the baseline closer size. Adjust upward for exterior doors, doors exposed to wind or pressure differentials, and doors with heavy hardware or glass lites that add weight. For interior doors on accessible routes, verify that the selected size does not exceed 5 lbf opening force at the latch edge.
Select the Arm Type
The arm type is determined by the mounting condition and the architectural specification. Use the following guidelines.
- Regular arm: Default choice when the closer can be mounted on the pull side with no aesthetic or clearance restrictions. Provides the highest efficiency.
- Parallel arm: Required when the specification calls for mounting on the push side, or when the closer must not project into a corridor or public space. Remember to account for the 20–25% reduction in closing force.
- Top jamb: Use when the door’s top rail is too narrow to support a closer body, or per the architectural specification.
Identify Required Functions
Determine which adjustable functions are needed for the application.
- Backcheck: Recommended for high-traffic openings and any door subject to wind load or forceful opening.
- Delayed action: Specify for healthcare, assisted-living, and openings with heavy cart or equipment traffic. Verify fire-rating compatibility.
- Hold-open: Specify only for non-fire-rated openings, or for fire-rated openings with fire alarm–connected electromagnetic hold-open devices.
Verify the Grade
Match the closer grade to the traffic level and project specification. Most commercial projects specify Grade 1. Grade 2 is acceptable for interior office environments. Always check the project’s hardware specification (typically Division 08 of the construction specification) for the required grade.
Confirm Fire Rating Compatibility
For fire-rated openings (20-minute, 45-minute, 60-minute, 90-minute, or 3-hour/180-minute), verify that the closer is listed for the specific fire rating. Confirm that the closer, arm type, and any optional functions (delayed action, hold-open) are all included in the listing. The Authority Having Jurisdiction (AHJ) has final approval on fire-rated assemblies.
Quick-Reference Selection Table
The following table provides a simplified selection guide for common commercial door configurations. Use this as a starting point and verify against the project specification and applicable codes.
Application | Door Size | Closer Size | Arm Type | Grade | Notes |
Interior office door | 3’0” x 7’0” | 3 | Parallel | 1 or 2 | 5 lbf max opening force (ADA) |
Interior corridor door | 3’0” x 7’0” | 3–4 | Parallel | 1 | Backcheck recommended |
Interior fire-rated door | 3’0” x 7’0” | 3–4 | Parallel or Regular | 1 | Must carry matching fire listing |
Exterior entrance | 3’0” x 7’0” | 4–5 | Regular or Parallel | 1 | 15 lbf max; wind load considerations |
Wide exterior door | 3’6” x 7’0” | 5–6 | Regular | 1 | Verify closer capacity for door weight |
Healthcare corridor | 3’6” x 7’0” | 4–5 | Parallel | 1 | Delayed action recommended |
Pair of doors (per leaf) | 6’0” pair | 4 per leaf | Regular or Parallel | 1 | Coordinator may be required |
Common Door Closer Selection Mistakes
Avoid these common errors when specifying or selecting commercial door closers:
- Undersizing the closer to meet ADA force limits. If the closer cannot latch the door reliably, the solution is not a smaller closer. Address excessive friction in the hinges, weatherstripping, or latch/strike alignment first.
- Ignoring the arm type’s effect on closing force. A size 4 closer in parallel arm does not deliver size 4 force. Always reference the closer’s rating for the specific arm configuration.
- Specifying hold-open on fire-rated doors. Hold-open closers are prohibited on fire-rated openings unless connected to the fire alarm system for automatic release.
- Using a Grade 3 closer on a high-traffic opening. The closer will fail well before the expected service life of the door and frame assembly, requiring premature replacement.
- Failing to verify the closer’s fire listing. An unlisted closer installed on a fire-rated opening voids the entire assembly’s rating, regardless of the closer’s quality or performance.
- Not accounting for wind load on exterior doors. Exterior doors exposed to prevailing winds or building pressure differentials may require a larger closer size than the door’s width and weight alone would indicate.
Industry Standards Referenced
The following standards govern the selection, testing, and installation of commercial door closers in the United States.
- ANSI/BHMA A156.4: Door Closers – Closer Functions (defines sizes, grades, and performance criteria)
- ADAAG (Americans with Disabilities Act Accessibility Guidelines): Section 4.13.11 – Door opening force requirements
- ICC A117.1: Accessible and Usable Buildings and Facilities – opening force and closing speed requirements
- NFPA 80: Standard for Fire Doors and Other Opening Protectives – self-closing requirements for fire-rated openings
- NFPA 101: Life Safety Code – egress door requirements
- UL 10C / ASTM E2074: Fire Test of Door Assemblies – testing standard for fire-rated door assemblies
Configure Your Door Assembly
CDF’s ProBuilder tool allows contractors and facility managers to configure complete door, frame, and hardware assemblies online. During configuration, ProBuilder displays compatible closer options based on the door size, frame type, and fire rating selected. ProBuilder provides instant pricing and validates that all assembly components are compatible.
For assistance selecting a closer or configuring an assembly for your project, call (855) 769-9895 or email sales@cdfdoors.com. CDF’s sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.
Frequently Asked Questions
What size door closer do I need for a 36-inch commercial door?
A 36-inch (3’0”) commercial door typically requires a size 3 or size 4 closer. Size 3 is standard for interior doors at normal weight. Size 4 is appropriate for exterior doors, fire-rated doors, or doors with heavy hardware. If the closer is mounted in parallel arm configuration, size up by one to compensate for the reduced closing efficiency.
What is the difference between regular arm and parallel arm door closers?
Regular arm mounts the closer body on the pull side of the door with the arm extending to the frame head. Parallel arm mounts the closer body on the push side with the arm running parallel to the door face. Parallel arm provides a lower profile and is standard for corridor applications, but delivers approximately 20–25% less closing force than regular arm on the same closer body.
What is backcheck on a door closer?
Backcheck is a hydraulic function that resists the door being thrown open too forcefully. It engages at approximately 70 to 85 degrees of opening and cushions the remaining opening motion. Backcheck protects the door, frame, wall, and closer from impact damage. It is a standard feature on most commercial-grade closers and is especially important in high-traffic areas.
Can I use a door closer with hold-open on a fire-rated door?
A mechanical hold-open closer cannot be used on a fire-rated door. Fire-rated doors must close and latch automatically from any open position. The only way to hold a fire-rated door open is with an electromagnetic hold-open device connected to the building’s fire alarm system, which releases the door automatically upon alarm activation. This applies to all fire rating levels: 20-minute, 45-minute, 60-minute, 90-minute, and 3-hour/180-minute.
What is the maximum door opening force allowed by ADA?
For interior hinged doors on accessible routes, the maximum opening force is 5 lbf (pounds of force). Exterior doors are commonly limited to 15 lbf, though requirements vary by jurisdiction. Fire-rated doors may be permitted up to 15 lbf to ensure positive latching. Opening force is measured at the latch edge of the door with a push-pull gauge and the latch retracted.
What is the difference between Grade 1, Grade 2, and Grade 3 door closers?
ANSI/BHMA A156.4 defines three closer grades. Grade 1 closers are tested to 10,000,000 cycles and are required for high-traffic commercial openings. Grade 2 closers are tested to 2,000,000 cycles and suit medium-traffic interior applications. Grade 3 closers are tested to 500,000 cycles and are limited to light-traffic or residential use. Most commercial project specifications require Grade 1.
What door closer functions are required for a fire-rated opening?
Fire-rated openings (20-minute, 45-minute, 60-minute, 90-minute, and 3-hour/180-minute) require a self-closing device that returns the door to the fully closed and latched position from any open angle. The closer must carry a fire listing matching the assembly rating. Hold-open is prohibited unless connected to the fire alarm for automatic release. Delayed action must be specifically listed for fire-rated use. The closing cycle must comply with NFPA 80 timing requirements.
How do I know if my door closer is the right size?
Measure the opening force at the latch edge of the door with a push-pull gauge (latch retracted). For interior accessible doors, the force must not exceed 5 lbf. If the closer latches the door reliably and the opening force is within the required limit, the closer is correctly sized. If the door fails to latch, check for excessive hinge friction, weatherstripping drag, or latch/strike misalignment before increasing the closer size.
About This Guide
This guide reflects CDF Distributors’ standard specifications and field-tested recommendations used by commercial contractors nationwide. The information is based on publicly available ANSI/BHMA standards, ADA accessibility guidelines, and NFPA fire protection standards as applied to commercial door assemblies.
For questions about door closer selection or to order a complete door assembly, contact CDF at (855) 769-9895 or sales@cdfdoors.com. Configure your assembly online at cdfdistributors.com using ProBuilder.
