DW Electrical specialises in design installation and maintenance of all electrical & mechanical building services. The company offers installation and maintenance services for building energy management systems, fire alarms, security access control, CCTV systems, lighting design & controls, etc. to commercial, industrial and domestic sectors.

DAB Fire Engineering design reliable gaseous fire suppression systems and components that give peace of mind to customers. Their cylinder valve design for carbon dioxide systems has been in used for over 40 years in land, marine and off-shore applications.

Dafoos Fire and Security is one of market leaders in the Fire Protection Industry in United Arab Emirates (UAE). Their core services are focused around - Automatic Fire Detection, Fire Suppression, Voice Evacuation, Access Control, Security and Surveillance systems – and in providing end-to-end design, erection and commissioning and maintenance of both active and passive Fire Protection Systems, Security Systems, Products and services.

Daimler Trucks North America, a Daimler Truck AG company, is the largest heavy-duty truck manufacturer in North America and a leading producer of medium-duty trucks and specialized commercial vehicles. Headquartered in Portland, Oregon, Daimler Trucks North America manufactures, sells and services several renowned commercial vehicle brands including Freightliner Trucks, Western Star Trucks, Thomas Built Buses, and Freightliner Custom Chassis.

The fire department was founded in 1903 and is currently composed of 35 volunteer members. The department is a member of the State Firefighters & Fire Marshals Association of Texas. To maintain membership within the department, each member must maintain a certain percentage of calls, drills, and meeting attendance each year to stay in the department. The department is also a member of the Panhandle Firefighters & Fire Marshals Association.

Dante Group are fire detection and alarm specialists. The company is a Notifier by Honeywell accredited Gold Partner, and BAFE SP203 certified designer, as well as installer and maintenance provider with expertise in fire detection brands and protocols. Dante Group also designs and installs automated fixed gas extinguishing systems to protect valuable assets, data centres, works of art, plant and machinery.

Darkin Architects provide a quality certified service refined through ongoing customer feedback to ensure the best experience. Services offered include Architecture, Sustainability, Design, and Planning.

Darlington Fire Extinguishers and PAT Testing is a UK-based fire extinguisher installation, maintenance, testing, hire and certification company. They also provide multi-year warranty on all water, foam, powder, wet chemical and CO2 extinguishers.

Decon7 Systems operates within the environment’s most dangerous pathogenic, chemical, and energetic hazards and threats. Decon7 offers the patented anti-microbial chemical D7 for cleaning, sanitizing, and disinfecting. D7’s adhesion allows for the longest contact time and was developed and formulated to be efficacious against a wide variety of organisms. D7 is used in a wide variety of industries, including biosecurity and public safety.

Decontex are renowned personal protective equipment (PPE) and safety gear suppliers. They have created a system that thoroughly cleans firefighters' uniforms after each intervention, significantly reducing exposure to toxic components.

Defence Medical Services (DMS) is made up of the Royal Navy Medical Service, Army Medical Service, the Royal Air Force Medical Service and the Headquarters DMS Group (HQ DMS GP). The primary role of the DMS is to promote, protect and restore the health of the UK armed forces to ensure that they are ready and medically fit to go where they are required in the UK and throughout the world.

Defensor Life Safety Systems provides a complete solution for all commercial fire detection and alarm system needs. They are specialists in commercial fire alarm systems. Boasting an unrivaled depth of skill and experience, coupled with an emphasis on customer service excellence, Defensor supports businesses by protecting people and property, because there is nothing more important than life safety.

The Delta Fire Department is a full volunteer organization that has served the needs of Delta City and areas of western Millard County, dating back to 1941, when a hearty group of individuals determined there was a need for fire protection, and they set out to fill that need.

Established in 2005, Desu Systems BV specializes in Flame and Gas Detection & Kitchen Fire Suppression and is the Master European Distributor and Channel Partner for Spectrex SharpEye Optical Flame Detection, SafEye Quasar Open Path Gas Detection, ESP Safety Vector and SGOES Point Gas Detection, Hansentek Spark & Ember Detection, Sensia Infrared Thermal Imaging (OGI) solutions and Buckeye Kitchen Mister restaurant fire suppression.

Detect Fire & Security Ltd. is a renowned provider of fire protection, commercial and home fire safety equipment, fire alarms and detectors, fire extinguishers, fire risk assessment and intruder alarm systems.

DetectFire is America's largest independent designer, manufacturer and distributor of advanced UL Listed Fire Detection System, and UL Listed Addressable Detectors & Alarm, Voice Evacuation & Communication Systems, and Controlled Access & Security solutions, UL Listed Agent Release Panel serving the global marketplace.