Understanding Dogging Options for Panic Bars
When it comes to managing buildings with high occupancy or heavy foot traffic, efficient door hardware becomes a critical consideration. Panic bars, or exit devices, are essential for enabling a quick, safe egress during emergencies. However, for day-to-day operations, particularly in high-traffic areas, property managers, building owners, and businesses often need a way to enable free-flowing access through these doors. That’s where "dogging" comes into play. But what exactly is dogging, and what are the available options? Let's break it down.
What Is Dogging?
Dogging is a feature designed to hold the latchbolt of a panic bar retracted, effectively converting the door into a push/pull function. This eliminates the need to press the panic bar to open the door, allowing users to simply push or pull the door to enter or exit. It’s a common solution for businesses or buildings requiring easier access for heavy traffic areas while maintaining the durability and reliability of exit hardware.
For example, in some high-traffic stores, the main entrance might have an exit device installed for emergency egress compliance. However, during operational hours, using dogging, the doors can function more conveniently as push/pull doors for easy customer access.
Dogging options generally fall into two categories—mechanical dogging and electrical dogging—each suited for specific applications and building requirements.
1. Mechanical Dogging
How It Works
Mechanical dogging involves manually holding the latchbolt retracted. This typically requires the use of a device, such as a hex key or, in some cases, a cylinder mechanism. When the push bar of the door is pressed, the key is turned to engage the dogging feature. Internal components then hold the latchbolt in the retracted position until the dogging mechanism is manually released using the key.
Advantages
Cost-Effective: Mechanical dogging is simpler and more affordable than its electrical counterpart.
No Electrical Dependency: It requires no power supply, making it reliable in locations without available electrical infrastructure.
Considerations
Fire Exit Compliance: Mechanical dogging cannot be used on fire-rated exit doors. Fire exit hardware must always be self-latching in the event of a fire to ensure the door is secure and prevents the spread of smoke or fire.
Manual Re-engagement: The latchbolt must be manually re-engaged when dogging is no longer needed.
Best Applications
Non-fire-rated exits that experience frequent use, such as back entrances to stores, warehouses, or employee break areas, are excellent candidates for mechanical dogging solutions.
2. Electrical Dogging
How It Works
Electrical dogging advances the concept by using an electric motor or solenoid to retract and hold the latchbolt in place. Instead of engaging or releasing the mechanism manually, electrical dogging operates remotely through an access control system or a scheduling program. It’s particularly useful for managing doors in larger or more complex buildings where manual intervention isn’t viable for everyday operations.
Advantages
Automation: Electrical dogging can be controlled remotely, making it more convenient for property managers. For instance, it can be programmed to automatically engage at the start of business hours and disengage after closing.
Fire Exit Compatibility: Electrical dogging is permissible on fire-rated exit devices when integrated with the building’s fire alarm system. If the fire alarm is activated, the electrical dogging feature is automatically disengaged, ensuring compliance with self-latching requirements.
Considerations
Higher Cost: Electrical components and installation are more expensive compared to mechanical dogging systems.
Power Dependency: These systems require a reliable power supply and may need a power backup to ensure functionality during outages.
Best Applications
Electrical dogging is ideal for high-traffic doors in shopping malls, airports, hospitals, and large office buildings where automated access control systems are already in place.
Electrical Dogging and Fire Exit Safety
A notable advantage of electrical dogging is its compatibility with fire-rated exit doors. When connected to the building’s fire alarm system, electrical dogging complies with safety requirements while providing day-to-day convenience.
For example, a shopping mall can program its entrance doors to remain dogged between 7 AM and 10 PM but automatically revert to a secure, self-latching state if the fire alarm is triggered.
Finding the Right Option for Your Needs
Choosing between mechanical and electrical dogging depends on several factors:
Nature of the Door: Is it a fire-rated door? If so, electrical dogging is your only option.
Budget Constraints: Mechanical dogging is a more cost-effective solution, requiring no electrical components.
Traffic Volume: High-traffic and high-security areas benefit significantly from the automation of electrical dogging.
Automation Requirements: If you rely on an access control system or have specific operational schedules, electrical dogging might be the better fit.
Exit Device Trim and Access Control
Dogging options often work hand-in-hand with exit device trim and access control systems. Exit device trim refers to the external hardware, like levers or pulls, that allows re-entry. When paired with dogging, it creates a seamless access solution for buildings. Access control systems add another layer of convenience, enabling building managers to control when doors are dogged or latched based on pre-set schedules.
Disclaimer: The information provided in this article is for informational purposes only and should not be considered as professional advice. It is essential to consult with a qualified professional or local building authority regarding building codes, fire safety regulations, and the suitability of panic bars and dogging options for your specific circumstances. Ensuring compliance with all applicable laws and safety standards is crucial for the safety and security of your facility.
Commenti