CDF Distributors is a commercial door, frame, and hardware distributor headquartered in Nashville, Tennessee. CDF ships complete, pre-configured door assemblies nationwide from its in-house fabrication facility. Configure your assembly online at cdfdistributors.com using ProBuilder, or contact CDF at (855) 769-9895 or sales@cdfdoors.com.

About CDF Distributors

Are fire doors exempt from ADA force requirements?

Yes. Fire doors are exempt from the 5 lbf maximum operating force requirement under ADA. However, they must still meet all other ADA requirements including clear width, threshold height, hardware operation, closing speed, and maneuvering clearances.

Can I use a round knob on an ADA-accessible door?

No. Round knobs require grasping and twisting, which violates ADA hardware requirements. Replace round knobs with lever handles or install a lever adapter. All hardware on accessible routes must pass the closed-fist test — operable by pushing, pulling, or pressing without grasping.

What is the closed-fist test?

The closed-fist test is an informal but widely used method to check ADA hardware compliance. Make a fist and attempt to operate the hardware. If you can operate it with a closed fist (no grasping or twisting), the hardware is likely compliant. Lever handles, push bars, and push/pull plates pass this test. Round knobs and thumb-turn deadbolts typically fail.

How do I measure the 5-second closer sweep time?

Open the door to 90 degrees and release it. Using a stopwatch, time from the moment of release until the door reaches 12 degrees from the closed position (approximately 2.5 inches from the frame for a 36-inch door). The time must be at least 5 seconds. The final latching motion is not included in this measurement.

Do automatic door operators satisfy ADA requirements?

Automatic operators can enhance accessibility but are not a substitute for meeting manual ADA requirements. The door must still comply with all manual ADA requirements (clear width, threshold, hardware) in case the automatic operator fails. Some jurisdictions require automatic operators at primary accessible entrances.

Frequently Asked Questions

CDF's ProBuilder includes ADA compliance configuration that automatically specifies lever handles, compliant closers, and accessible thresholds. Configure your ADA-compliant assembly at cdfdistributors.com.

For assistance with your order, 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.

Configure Your Door Assembly

Fire-rated door assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute ratings. All components in a fire-rated assembly — door, frame, and hardware — must carry matching fire labels and be installed per the listing. Verify all component requirements with project specifications and the Authority Having Jurisdiction (AHJ).

A Note on Fire-Rated Assemblies

ProBuilder includes ADA compliance options that automatically configure compliant hardware. When ADA compliance is selected, ProBuilder specifies lever handles, appropriately sized closers, ADA-compliant thresholds, and correct mounting heights. This ensures every component meets accessibility requirements before the assembly arrives on site.

CDF ADA Compliance Support

Maneuvering clearances are the floor space required on each side of the door for a wheelchair user to approach and operate the door. Requirements vary by approach direction and door type.

• Pull side (hinge approach): 60 inches depth, door width plus 18 inches on the latch side

• Pull side (front approach): 60 inches depth, door width plus 18 inches on the latch side

• Push side (hinge approach): 54 inches depth for doors with closers, 48 inches without

• Push side (front approach): 48 inches depth, door width plus 0 inches on the latch side (12 inches if both closer and latch)

• Verify no obstructions (furniture, fixtures, columns) within the maneuvering clearance zone

• Floor surface within maneuvering clearance must be level and firm (maximum 1:48 slope)

Maneuvering Clearances

ADA requires door hardware that can be operated with one hand and does not require tight grasping, pinching, or twisting of the wrist.

• Lever handles: compliant — they can be operated by pressing down without grasping

• Round knobs: NOT compliant — they require grasping and twisting

• Panic/exit devices: compliant — they activate with a push motion

• Hardware mounting height: operable parts must be between 34 and 48 inches above the finished floor

• Verify hardware can be operated with a closed fist (the closed-fist test)

• Electronic access controls: mounting height and reach range must comply with ADA reach requirements

Hardware Operation

Thresholds create a raised edge at the bottom of the door opening. ADA limits threshold height to allow wheelchair and walker passage.

• Maximum threshold height: 1/2 inch for existing construction

• Maximum threshold height for new construction: 1/4 inch (recommended by many jurisdictions)

• Thresholds higher than 1/4 inch must have beveled edges with a maximum slope of 1:2

• Measure threshold height on both sides of the opening — the higher side determines compliance

• Verify the threshold is securely anchored and will not shift or rock when rolled over

Threshold Height

The door closer sweep time controls how quickly the door closes. ADA requires a minimum closing time to allow individuals using wheelchairs and walkers to pass through safely.

• Minimum sweep time: 5 seconds from 90 degrees to 12 degrees from the latch

• Measure with a stopwatch: open the door to 90 degrees, release, and time until the door is within 12 degrees of the frame

• The 12-degree measurement point is approximately 2.5 inches from the closed position for a standard 3-foot door

• Adjust the closer's sweep speed valve to achieve the minimum 5-second time

• The latching speed (final closing) is adjusted separately and is not included in the 5-second measurement

• Test in both directions for double-acting doors

Closer Sweep Time

Door operating force determines how much effort is required to open the door. ADA limits operating force to ensure individuals with limited upper body strength can operate the door.

• Maximum operating force for interior hinged doors: 5 pounds-force (lbf)

• Fire doors are exempt from the maximum force requirement but should be set to the minimum force that achieves positive latching

• Exterior doors: no maximum force specified by ADA, but best practice is to minimize force

• Measure force with a door force gauge at the latch side, 30 inches above the floor

• Measure force required to open the door from the closed and latched position

• If the door exceeds 5 lbf: adjust the closer, check for binding at hinges or latch, verify the door is not rubbing on the frame or floor

Operating Force

The clear opening width is the unobstructed passage width when the door is open 90 degrees. This measurement determines whether a wheelchair or mobility device can pass through the opening.

• Minimum clear opening width: 32 inches measured between the face of the door at 90 degrees and the opposite stop

• For paired doors: at least one leaf must provide 32 inches of clear width

• Measure at the narrowest point — account for hinges, closers, and any hardware that protrudes into the opening

• Primary accessible entrances: many jurisdictions require 36-inch clear width

• For doors with panic hardware: measure clear width with the push bar in the normal (non-activated) position

Clear Opening Width

The Americans with Disabilities Act (ADA) and the ICC/ANSI A117.1 Accessible and Usable Buildings standard establish specific requirements for door assemblies in accessible routes. These requirements cover opening width, operating force, closing speed, threshold height, hardware operation, and maneuvering clearances.

This checklist covers every measurable ADA requirement for a door assembly. Verify each item with the appropriate measurement tool. Document all measurements for compliance records.

ADA Door Assembly Requirements Overview

Verification steps to confirm a commercial door assembly meets ADA accessibility requirements.

This guide answers: How Do You Verify a Commercial Door Assembly Meets ADA Requirements?