--- title: DGA Blog | Business Security and Fire Systems | Fire Systems description: Fire Systems | Our business security and fire systems experts answer the most frequently asked questions, no holds barred. Read on. --- [![cropped-DGA-Security-Logo-nsr-1-1](https://blog.dga.com/hubfs/Assets/logo/cropped-DGA-Security-Logo-nsr-1-1.png)](https://www.dga.com/) Search For: - [Contact](https://www.dga.com/contact/) - [Login](https://connect.dga.com/) - [Careers](https://www.dga.com/careers/) [Get A Free Consultation](https://www.dga.com/free-consultation/) - [Business Security](https://www.dga.com/business-security/) - [Intrusion Alarms](https://www.dga.com/business-security/intrusion-alarms/) - [Video Surveillance](https://www.dga.com/business-security/video-surveillance/) - [Access Control](https://www.dga.com/business-security/access-control/) - [Security System Monitoring](https://www.dga.com/business-security/alarm-monitoring/) - [Environmental Monitoring](https://www.dga.com/business-security/environmental-monitoring/) - [Elevator Emergency Communication](https://www.dga.com/business-security/elevator-emergency-communication/) - [Fire Systems](https://www.dga.com/fire-systems/) - [Design and Installation](https://www.dga.com/fire-systems/design-installation/) - [Testing and Inspection](https://www.dga.com/fire-systems/testing-and-inspection/) - [Fire Alarm System Monitoring](https://www.dga.com/fire-systems/alarm-monitoring/) - [Contractor Support](https://www.dga.com/fire-systems/contractor-support/) - [Industries](https://www.dga.com/industries/) - [Art Galleries](https://www.dga.com/industries/art-gallery-security/) - [Banking and Financial](https://www.dga.com/industries/bank-security/) - [Cannabis](https://www.dga.com/industries/cannabis-security/) - [Hotels](https://www.dga.com/industries/hotel-security/) - [Jewelry](https://www.dga.com/industries/jewelry-security/) - [Nonprofits](https://www.dga.com/industries/nonprofit-security/) - [Offices](https://www.dga.com/industries/office-security/) - [Property Management](https://www.dga.com/industries/property-security/) - [Religious Institutions](https://www.dga.com/industries/religious-institution-security/) - [Restaurants](https://www.dga.com/industries/restaurant-security/) - [Retail](https://www.dga.com/industries/retail-security/) - [Tools](https://www.dga.com/tools) - [DGA Blog](https://blog.dga.com) Search For: [Business Security](https://www.dga.com/business-security/) Business Security [Intrusion Alarms](https://www.dga.com/business-security/intrusion-alarms/) [Video Surveillance](https://www.dga.com/business-security/video-surveillance/) [Access Control](https://www.dga.com/business-security/access-control/) [Security System Monitoring](https://www.dga.com/business-security/alarm-monitoring/) [Environmental Monitoring](https://www.dga.com/business-security/environmental-monitoring/) [Elevator Emergency Communication](https://www.dga.com/business-security/elevator-emergency-communication/) [Fire Systems](https://www.dga.com/fire-systems/) Fire Systems [Design and Installation](https://www.dga.com/fire-systems/design-installation/) [Testing and Inspection](https://www.dga.com/fire-systems/testing-and-inspection/) [Fire Alarm System Monitoring](https://www.dga.com/fire-systems/alarm-monitoring/) [Contractor Support](https://www.dga.com/fire-systems/contractor-support/) [Industries](https://www.dga.com/industries/) Industries [Art Galleries](https://www.dga.com/industries/art-gallery-security/) [Banking and Financial](https://www.dga.com/industries/bank-security/) [Cannabis](https://www.dga.com/industries/cannabis-security/) [Hotels](https://www.dga.com/industries/hotel-security/) [Jewelry](https://www.dga.com/industries/jewelry-security/) [Nonprofits](https://www.dga.com/industries/nonprofit-security/) [Offices](https://www.dga.com/industries/office-security/) [Property Management](https://www.dga.com/industries/property-security/) [Religious Institutions](https://www.dga.com/industries/religious-institution-security/) [Restaurants](https://www.dga.com/industries/restaurant-security/) [Retail](https://www.dga.com/industries/retail-security/) [Tools](https://www.dga.com/tools) [DGA Blog](https://blog.dga.com) [Contact](https://www.dga.com/contact/) [Login](https://connect.dga.com/) [Careers](https://www.dga.com/careers/) Get A Free Consultation - Categories [Subscribe](https://info.dga.com/blog-subscriptions) - [Access Control](https://blog.dga.com/tag/access-control) - [Fire Systems](https://blog.dga.com/tag/fire-systems) - [Intrusion Alarms](https://blog.dga.com/tag/intrusion-alarms) - [Video Surveillance](https://blog.dga.com/tag/video-surveillance) - [Security Terms](https://blog.dga.com/tag/security-terms) # Blog DGA Security Blog Our business security and fire systems experts answer the most frequently asked questions, no holds barred. Read on. [Subscribe](https://info.dga.com/blog-subscriptions) - Categories - [Access Control](https://blog.dga.com/tag/access-control) - [Fire Systems](https://blog.dga.com/tag/fire-systems) - [Intrusion Alarms](https://blog.dga.com/tag/intrusion-alarms) - [Video Surveillance](https://blog.dga.com/tag/video-surveillance) - [Security Terms](https://blog.dga.com/tag/security-terms) - [Subscribe](https://info.dga.com/blog-subscriptions) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-heat-detector) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is a Heat Detector?](https://blog.dga.com/what-is-heat-detector) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) August 21st, 2025 A heat detector is a fire safety device designed to sense changes in temperature rather than detecting smoke. These devices activate an alarm when they detect a rapid increase in temperature or when the ambient temperature exceeds a predetermined threshold. [Read More](https://blog.dga.com/what-is-heat-detector) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-heat-detector](mailto:?body=https://blog.dga.com/what-is-heat-detector) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-manual-pull-station) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is a Manual Pull Station?](https://blog.dga.com/what-is-manual-pull-station) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) June 12th, 2025 A manual pull station is a wall-mounted device that allows individuals to manually trigger a fire alarm in case of an emergency. Typically located near exit doors and along escape routes, manual pull stations serve as a backup to automatic fire detection systems, ensuring that people can quickly alert building occupants and emergency responders to a fire. [Read More](https://blog.dga.com/what-is-manual-pull-station) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-manual-pull-station](mailto:?body=https://blog.dga.com/what-is-manual-pull-station) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-co-detector) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is a CO Detector?](https://blog.dga.com/what-is-co-detector) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) May 16th, 2025 A carbon monoxide (CO) detector is a life-saving device designed to monitor the presence of carbon monoxide in the air. Carbon monoxide is often called the "silent killer" because it is odorless, colorless, and highly toxic. It is produced when carbon-based fuels—such as gasoline, oil, or natural gas—burn incompletely. Common sources include running vehicles, furnaces, water heaters, stoves, and generators. [Read More](https://blog.dga.com/what-is-co-detector) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-co-detector](mailto:?body=https://blog.dga.com/what-is-co-detector) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-fire-door) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is a Fire Door?](https://blog.dga.com/what-is-fire-door) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) January 15th, 2025 A fire door is a door with a fire-resistance rating made from materials that can withstand fire and high temperatures for a specified period. They are designed to limit the spread of fire and smoke in a building. Fire doors are rigorously tested to meet stringent safety standards, ensuring they perform effectively during a fire. [Read More](https://blog.dga.com/what-is-fire-door) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-fire-door](mailto:?body=https://blog.dga.com/what-is-fire-door) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-redundancy) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is Redundancy?](https://blog.dga.com/what-is-redundancy) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) November 20th, 2024 Redundancy in a monitoring center refers to a duplication of critical systems such that if any component of the monitoring infrastructure fails, there is a backup in place. There are three different levels of redundancy: cold, warm, and hot. [Read More](https://blog.dga.com/what-is-redundancy) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-redundancy](mailto:?body=https://blog.dga.com/what-is-redundancy) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-fire-watch) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is a Fire Watch?](https://blog.dga.com/what-is-fire-watch) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) June 6th, 2024 A fire watch is a temporary measure that involves having fire guards at a premises continuously monitoring a building or part of a building to identify and manage fire hazards. Fire guards possess an F-01 certificate of fitness for fire guard issued by the New York City Fire Department (FDNY). Monitoring a building includes detecting early signs of fire, raising an alarm in case of a fire, notifying the fire department, and performing other fire safety tasks as directed by the NYC Commissioner. A fire watch becomes necessary when the fire protection system is under any condition of impairment (such as a broken sprinkler system, standpipe/hose system, fire pump, fire protection water supplies, fire mains, fire alarm systems, etc.). [Read More](https://blog.dga.com/what-is-fire-watch) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-fire-watch](mailto:?body=https://blog.dga.com/what-is-fire-watch) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-authority-having-jurisdiction) [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is an Authority Having Jurisdiction?](https://blog.dga.com/what-is-authority-having-jurisdiction) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) May 9th, 2024 Authority Having Jurisdiction (AHJ) are government organizations, offices, or individuals that have the power to enforce and interpret the requirements of a fire code and approve equipment, materials, installations or procedures. They are a critical aspect of ensuring the safety and effectiveness of fire systems and fire system monitoring. By working closely with the AHJ, installers and monitoring centers can demonstrate their commitment to maintaining a safe and reliable system for detecting and responding to fires. [Read More](https://blog.dga.com/what-is-authority-having-jurisdiction) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-authority-having-jurisdiction](mailto:?body=https://blog.dga.com/what-is-authority-having-jurisdiction) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-underwriters-laboratories) [Access Control](https://blog.dga.com/topic/access-control) | [Video Surveillance](https://blog.dga.com/topic/video-surveillance) | [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Intrusion Alarms](https://blog.dga.com/topic/intrusion-alarms) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is Underwriters Laboratories?](https://blog.dga.com/what-is-underwriters-laboratories) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) June 22nd, 2023 Underwriters Laboratories (UL) is a trusted resource known around the world for product safety and service certification. Since being founded in 1894, UL examines and tests devices, systems, and material to determine how their performance affects life, fire, casualty, hazards, and crime prevention. [Read More](https://blog.dga.com/what-is-underwriters-laboratories) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-underwriters-laboratories](mailto:?body=https://blog.dga.com/what-is-underwriters-laboratories) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-is-integration) [Access Control](https://blog.dga.com/topic/access-control) | [Video Surveillance](https://blog.dga.com/topic/video-surveillance) | [Fire Systems](https://blog.dga.com/topic/fire-systems) | [Intrusion Alarms](https://blog.dga.com/topic/intrusion-alarms) | [Security Terms](https://blog.dga.com/topic/security-terms) ## [What is Integration?](https://blog.dga.com/what-is-integration) By: [Isabel Leckie](https://blog.dga.com/author/isabel-leckie) May 25th, 2023 Integration in security refers to the interactivity between different parts of a security system. Here are some examples of what you can accomplish with an integrated security system. [Read More](https://blog.dga.com/what-is-integration) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-is-integration](mailto:?body=https://blog.dga.com/what-is-integration) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/how-to-avoid-ecb-violations) [Fire Systems](https://blog.dga.com/topic/fire-systems) ## [ECB Violations for your NYC Fire Alarm System: How to Avoid and Resolve Them](https://blog.dga.com/how-to-avoid-ecb-violations) By: [Daniel Torpey](https://blog.dga.com/author/daniel-torpey) May 19th, 2022 You’re going about your day when you receive a letter from the City of New York informing you that your business has an ECB violation. Though resolving ECB violations isn’t fun, it doesn’t have to be difficult. [Read More](https://blog.dga.com/how-to-avoid-ecb-violations) Share - Close - - - - [mailto:?body=https://blog.dga.com/how-to-avoid-ecb-violations](mailto:?body=https://blog.dga.com/how-to-avoid-ecb-violations) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/emergency-control-function-interfaces-in-fire-alarm-systems) [Fire Systems](https://blog.dga.com/topic/fire-systems) ## [What Are Emergency Control Function Interfaces in Fire Alarm Systems?](https://blog.dga.com/emergency-control-function-interfaces-in-fire-alarm-systems) By: [Daniel Torpey](https://blog.dga.com/author/daniel-torpey) August 31st, 2020 Emergency Control Function Interfaces allow fire alarm systems to communicate with other critical building systems during a fire emergency to ensure the safe evacuation of occupants. [Read More](https://blog.dga.com/emergency-control-function-interfaces-in-fire-alarm-systems) Share - Close - - - - [mailto:?body=https://blog.dga.com/emergency-control-function-interfaces-in-fire-alarm-systems](mailto:?body=https://blog.dga.com/emergency-control-function-interfaces-in-fire-alarm-systems) [![Blog Feature](https://cdn2.hubspot.net/hubfs/298890/blog-files/blog--cards-feature.png)](https://blog.dga.com/what-are-remote-annunciators-in-fire-alarm-systems) [Fire Systems](https://blog.dga.com/topic/fire-systems) ## [What Are Remote Annunciators in Fire Alarm Systems?](https://blog.dga.com/what-are-remote-annunciators-in-fire-alarm-systems) By: [Daniel Torpey](https://blog.dga.com/author/daniel-torpey) August 27th, 2020 Remote annunciators are smaller panels that provide a fire system status and a limited set of functional switches (e.g., acknowledge a signal or silence an alarm). [Read More](https://blog.dga.com/what-are-remote-annunciators-in-fire-alarm-systems) Share - Close - - - - [mailto:?body=https://blog.dga.com/what-are-remote-annunciators-in-fire-alarm-systems](mailto:?body=https://blog.dga.com/what-are-remote-annunciators-in-fire-alarm-systems) [All posts](https://blog.dga.com/all) [Next](https://blog.dga.com/tag/fire-systems/page/2) [![DGA Security](https://blog.dga.com/hubfs/Assets/logo/cropped-DGA-Security-Logo-nsr-1-1.png)](https://www.impactbnd.com) 429 West 53rd Street New York, New York 10019 ##### Contact Sales 800 PICK DGA (800-554-5599) sales@dga.com ##### Contact Customer Care [customercare@dga.com](mailto:customercare@dga.com) 800-221-2300 ##### [Business Security](https://www.dga.com/business-security/) - [Intrusion Alarms](https://www.dga.com/business-security/intrusion-alarms/) - [Video Surveillance](https://www.dga.com/business-security/video-surveillance/) - [Access Control](https://www.dga.com/business-security/access-control/) - [Security System Monitoring](https://www.dga.com/business-security/alarm-monitoring/) - [Environmental Monitoring](https://www.dga.com/business-security/environmental-monitoring/) - [Elevator Emergency Communication](https://www.dga.com/business-security/elevator-emergency-communication/) - [Nationwide Service](https://www.dga.com/business-security/nationwide-service/) - [The DGA Vault at 580 Fifth Avenue](https://www.dga.com/vault/) ##### [Fire Alarm Systems](https://www.dga.com/fire-systems/) - [Design and Installation](https://www.dga.com/fire-systems/design-installation/) - [Testing and Inspection](https://www.dga.com/fire-systems/testing-and-inspection/) - [Fire Alarm System Monitoring](https://www.dga.com/fire-systems/alarm-monitoring/) - [Contractor Support](https://www.dga.com/fire-systems/contractor-support/) ##### [Industries](https://www.dga.com/industries/) - [Art Galleries](https://www.dga.com/industries/art-gallery-security/) - [Banking and Financial](https://www.dga.com/industries/bank-security/) - [Cannabis](https://www.dga.com/industries/cannabis-security/) - [Hotels](https://www.dga.com/industries/hotel-security/) - [Jewelry](https://www.dga.com/industries/jewelry-security/) - [Nonprofits](https://www.dga.com/industries/nonprofit-security/) - [Offices](https://www.dga.com/industries/office-security/) - [Property Management](https://www.dga.com/industries/property-security/) - [Religious Institutions](https://www.dga.com/industries/religious-institution-security/) - [Restaurants](https://www.dga.com/industries/restaurant-security/) - [Retail](https://www.dga.com/industries/retail-security/) ##### [Tools & Training](https://www.dga.com/tools/) - [DGAConnect Login](https://connect.dga.com/) - [DGAOneVIEW Login](https://dgaoneview.com/login#) - [DGA Payment Login](https://payment.mydga.com/login.aspx) - [Free System Training](https://www.dga.com/free-system-training) ##### [About DGA](https://www.dga.com/company/) - [Blog](https://blog.dga.com/) - [Careers](https://www.dga.com/careers/) - [Credentials](https://www.dga.com/credentials/) - [Meet Business Insurance Requirements](https://www.dga.com/meet-business-insurance-requirements/) © 2026 DGA Security Systems, Inc. | [Privacy Policy and Terms of Use](https://www.dga.com/privacy-policy/)