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Doucette began as a manufacturer of sea-water and fresh-water condensers, suction line heat exchangers and other components for air conditioning and refrigeration applications. In 1976, their SLHE line was listed by Underwriters Laboratory and the company began broadening its customer base from wholesale accounts to OEM'S. Doucette also entered the heat recovery market with a device designed to recover energy from air conditioning and refrigeration systems and used to heat potable water. This device, called a Desuperheater / Water Heater was upgraded in 1977 to include the vented double wall to preclude water contamination and refrigeration system damage. It was the first such device to win an Underwriters Laboratory listing and to meet nationwide health codes.

Dryvit Systems, Inc. is the original Exterior Insulation and Finish Systems (EIFS) manufacturer in the United States and the company that spawned the highly-successful EIFS industry in North America beginning in 1969.Dryvit EIFS is an enormously popular insulated cladding system in commercial and residential construction, offering a highly energy efficient, lightweight engineered cladding system with a vast array of finish options to suit any design consideration. Available in a number of system configurations to meet any climate or building condition, more than 1 in every 11 commercial buildings in the United States features Dryvit EIFS on the exterior.

Dunham-Bush (Europe) operates through Dunham-Bush Limited to manufacture heating and air-conditioning equipment and service installed systems. Dunham-Bush Limited traces its founding to several companies more than 100 years old. The holding company's other activities include the manufacture of stainless steel sanitary ware and catering equipment. Dunham-Bush (Europe) is owned by Durham-Bush International (Cayman) Limited and Dunham-Bush (Malaysia) Bhd. In turn, the Durham-Bush Group was bought by Russia-based Argomash Holdings in 2007.

Duro-Last began in 1978 with the simple need to find a roofing system that worked. Existing roofing systems presented a common problem - they required ongoing maintenance and continual expense, with no long-term solution in sight. John R. Burt, used his experience in fabricating pool liners to develop a remarkable new roofing membrane. Two years of additional testing resulted in the proprietary membrane formula still in use today.

Dynasonics Acoustics, the division of PCI Industries makes attenuators, duct silencers, casings, sound absorption panels, and louvers designed to eliminate noise in heating, ventilation, and air conditioning systems and other machinery. Dynasonics provides sound products and services to commercial and industrial customers, as well as for performance venues, throughout the world. Its products are sold through a network of sales representatives throughout the US and overseas. Dynasonics has been in operation for more than 30 years.

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