Automatic Glass Door Types
Each automatic door type serves different traffic patterns, space constraints, and architectural requirements. Understanding these options ensures you specify the right system for your commercial property.
Automatic Sliding Doors
Most CommonBi-parting glass panels slide horizontally to create an opening, then close automatically after the user passes through.
Best For
High-traffic commercial entrances, retail storefronts, medical facilities, and office buildings. The workhorse of commercial automatic doors.
Considerations
Require clear side space for the panels to pocket. Ceiling- or transom-mounted track systems need structural support. Emergency breakaway capability is required for egress doors.
Automatic Swinging Doors
A powered operator opens and closes a hinged glass door, either a single leaf or a pair.
Best For
Interior commercial doors, ADA retrofits on existing swinging doors, and entrances where a sliding track cannot be accommodated.
Considerations
Require clearance for the door swing arc. The opening speed must be controlled to prevent the door from striking a person on the other side. Safety sensors on both sides of the door are essential.
Revolving Glass Doors
PremiumThree- or four-wing revolving doors rotate within a circular enclosure, allowing continuous traffic flow while maintaining a constant air seal between.
Best For
Prestige commercial buildings, hotels, hospital main entrances, and any location where energy efficiency and traffic flow are top priorities.
Considerations
Require a large footprint for the circular enclosure. Must include a breakaway mechanism and adjacent swing door for emergency egress and ADA accessibility. Higher installation and maintenance cost.
Automatic Folding Doors
Glass panels fold in a bi-fold or book-fold configuration, requiring less side stacking space than sliding panels.
Best For
Narrow entryways, retrofit installations where stacking space is limited, and interior openings that need to maximize clear width in tight floor plans.
Considerations
Folding mechanisms have more moving parts than sliding systems, requiring more frequent maintenance. Panel alignment and hinge adjustment are critical for smooth, quiet operation.
ADA Compliance for Automatic Glass Doors
The Americans with Disabilities Act sets specific requirements for automatic doors to ensure accessible entry for people with disabilities. Non-compliance exposes businesses to legal liability and, more importantly, creates barriers for customers and employees. Virginia, Maryland, and DC enforce these standards through building code inspections.
Clear Opening Width
Minimum 32 inches measured between the face of the door and the stop on the latch side. A 36-inch clear width is recommended for wheelchair and mobility device access.
Opening Speed
The door must begin opening before a person reaches the threshold. Sensors must detect both standing adults and seated wheelchair users approaching from any angle.
Hold-Open Time
The door must remain fully open long enough for a person using a wheelchair, walker, or crutches to pass completely through the opening without the door beginning to close on them.
Closing Force
In manual mode (power failure or switched off), the door must not require more than 5 pounds of force to open. Automatic door closers must be adjusted to meet this threshold.
Safety Sensors
Presence-detecting sensors must prevent the door from closing on a person or object in the doorway. Both the leading edge and the threshold zone must be monitored.
Emergency Egress
Automatic doors on required means of egress must have breakaway capability, allowing them to be pushed open manually during power failures or emergencies.
ANSI/BHMA A156.10 (Power Operated Pedestrian Doors) and ANSI/BHMA A156.19 (Power Assist and Low Energy Power Operated Doors) are the industry standards that define specific performance parameters for automatic doors. Expert Glass Repair ensures all automatic door installations and conversions in the DMV meet both ADA and ANSI requirements.
Sensor Technology and Activation Methods
The sensor system determines how reliably your automatic door detects approaching users and prevents closing on people in the doorway. Modern systems use a combination of activation and safety sensors for optimal performance.
Microwave Motion Sensors
Microwave sensors emit a low-power microwave field and detect movement within that field. They are the most common activation sensor for commercial automatic doors because they detect approaching people at a distance, allowing the door to begin opening before the person reaches the threshold. Detection range and sensitivity are adjustable. Microwave sensors work in all weather conditions and are not affected by temperature, sunlight, or surface color.
Infrared Presence Sensors
Active infrared sensors create a curtain of infrared beams across the threshold and detect when a person or object breaks the beam pattern. They are primarily used as safety sensors to prevent the door from closing while someone is in the doorway. Passive infrared sensors detect body heat and are used as both activation and presence sensors in some configurations.
Push Plates and Wave-to-Open Switches
Hardwired push plates (typically mounted at ADA-compliant height) and touchless wave switches provide intentional activation for low-energy automatic doors. These are common for interior suite doors, restroom entries, and ADA-accessible doors where automatic activation by motion sensor is not desired. Touchless wave switches have become increasingly popular in the DMV following heightened hygiene awareness.
Activation Mat Systems
Pressure-sensitive mats buried flush in the floor detect weight and activate the door when stepped on. Mat systems are reliable but less common in new installations because they require floor modification and can be affected by water infiltration and debris. They are still found in many existing DMV commercial buildings.
Maintenance Schedules and Best Practices
Regular maintenance is essential for the safe, reliable operation of automatic glass doors and for maintaining ADA compliance. A malfunctioning automatic door is both a safety hazard and an accessibility violation. Here is a recommended maintenance framework for DMV commercial properties.
Monthly (Staff Inspection)
Check door opening and closing speed. Verify sensor activation from multiple approach angles. Test manual operation and emergency breakaway. Inspect glass for cracks, chips, and seal integrity. Clean sensor lenses and track area.
Quarterly (Technician Service)
Lubricate guide rails, rollers, and pivot hardware. Test and calibrate sensor detection zones. Verify closing force does not exceed ADA limits. Inspect wiring, connections, and controller boards. Check battery backup function.
Semi-Annual (Comprehensive)
Full ANSI A156.19 compliance check. Replace worn rollers, guides, and weatherstripping. Test breakaway mechanism under full load. Inspect structural mounting of headers and tracks. Review and update maintenance log.
Annual (Full Audit)
Complete operational and safety audit per ANSI standards. Replace belts, drive components, and sensors at manufacturer-recommended intervals. Inspect and test fire alarm integration. Review ADA compliance documentation for code inspections.
Frequently Asked Questions
What are the ADA requirements for automatic glass doors?
The Americans with Disabilities Act requires that automatic doors provide a minimum clear opening width of 32 inches (36 inches recommended), activate before a person reaches the door, remain open long enough for a person using a wheelchair or mobility aid to pass through completely, and not require more than 5 pounds of force to open in manual mode. Sensors must detect both standing adults and wheelchair users. ANSI/BHMA A156.10 is the standard that governs automatic door systems for ADA compliance.
How often should automatic glass doors be serviced?
ANSI/BHMA A156.19 recommends inspection and maintenance at least once per year by a qualified technician. High-traffic commercial locations -- such as retail stores, hospitals, and office buildings in the DC metro area -- should be serviced quarterly or semi-annually. Monthly visual inspections by on-site staff should check for sensor alignment, door speed, closing force, glass condition, and weatherseal integrity.
What types of sensors are used on automatic glass doors?
The most common types are microwave sensors (detect motion), infrared sensors (detect body heat), activation mats (detect weight/pressure), and push-plate or wave-to-open switches. Most modern installations use a combination: a microwave presence sensor above the door detects approaching traffic, while a safety sensor at the threshold prevents the door from closing on a person or object in the doorway.
What is an emergency breakaway automatic door?
Emergency breakaway doors are designed to swing open in the direction of egress if pushed manually during a power failure or emergency. The breakaway mechanism releases the door from its powered track or pivot, allowing it to function as a manual swing door for safe evacuation. Building codes in Virginia, Maryland, and DC require breakaway capability on automatic doors that serve as required means of egress.
Can an existing manual glass door be converted to automatic?
In many cases, yes. Low-energy automatic door operators can be added to existing swinging glass doors, and surface-mounted automatic sliding systems can replace manual sliders. The conversion requires verifying that the door and frame can support the operator hardware, adding power and sensor wiring, and ensuring ADA compliance. Expert Glass Repair handles conversions for commercial properties throughout the DMV.
What is the difference between full-energy and low-energy automatic doors?
Full-energy automatic doors open and close at higher speeds and are activated by motion sensors without any user contact. They are the standard for high-traffic commercial entrances like retail stores and hospitals. Low-energy automatic doors operate at slower speeds and are typically activated by a push button, push plate, or wave switch. Low-energy systems are common for interior doors, office suites, and ADA-accessible entrances where traffic volume is moderate.
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By the Expert Glass Repair Team
Serving the DMV since 2004 -- DC, Northern Virginia & Maryland
Expert Glass Repair installs, repairs, and maintains automatic glass door systems for commercial properties throughout the Washington DC metro area. From new installations to ADA compliance upgrades to emergency repair, we provide full-service support. Fully Insured. Call (703) 679-7741 for a free commercial consultation.
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