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DEF SO Series

DEF SO Series

DEF SO fixtures are the industry standard for HVAC fixturing. They are designed for use in HVAC environments to provide surface irradiation of cooling coils to regain heat transfer, eliminate coil maintenance and improve indoor air quality. These fixtures feature a 120-277V waterproof ballast that will withstand the harshest HVAC environments. It’s plug-n-play, fixture-to-fixture, wiring scheme provides a quick, simple and error proof method for row assembly. When installed the DEF also provides a margin of kill of airborne infectious agents to lower counts of viable microorganisms in the occupied space. DEF fixtures are warranted for 3 years and typically pay for themselves in six months or less.

More Info & Pricing

DEF Standard Output fixtures meet all ASHRAE-supported product specifications and are suitable for most any UV-C application. They connect end-to-end using internal PnP connections for fast, simple, and reliable installations of any length and number of rows necessary to achieve the specified irradiance. They can be installed in supply, return, or exhaust plenums, and ducts, to disinfect moving air streams and surfaces, preventing microbial proliferation and transfer, and the buildup of organic materials. Various sizes and 120-277V voltage options allow application most anywhere.

Fixtures are factory-assembled and tested. They consist of a housing, waterproof power source, lamp sockets, quick connects, and lamp. Construction is designed to withstand HVACR environments and is UL/C-UL (ABQK) Listed.

Housing is constructed of heavy-gauge 304 stainless steel, and is equipped with 6 - ½" conduit knockouts on the fixture's top, bottom, and/or ends for ease of wiring. Fixtures can be mounted anywhere in an HVACR system or as shown on system plans.

Power supply is a waterproof, Type 1, outdoor, high-power factor, electronic rapid-start type with overload and end-of-lamp-life circuit protection that maximizes lamp radiance, life, and system reliability at temperatures of 1–70° C. Input: 120-277Vac (±10%), 50/60 Hz, with a sound rating of A.

Sockets are bi-pin, single-click safety, twist-lock type and constructed of polycarbonate.

Lamp is a very high output, T5 diameter, mini bi-pin type that produces broadband UV-C of 253.7 nm. Each lamp produces the specified output at any airflow velocity and heating and cooling temperatures of 1–70° C. Minimum useful lamp life is 9,000 -18,000 when used continuously, with no more than a 20% output loss depending on conditions.

Independent testing — Fixtures have been independently tested to verify UV output under various conditions and in conformance to UL/C-UL (ABQK).


  • Meets all market specifications
  • Industry's lowest cost of ownership
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  • Meets all market specifications
  • Industry's lowest cost of ownership
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UV-Com Control Panel

  • Simple Go/No Go "real-time" verification of both lamp and ballast operation
  • Provides a highly visible green status LED indicator locally
  • Monitor up to 8 lamps/ballasts or daisy chain multiples
  • Offers a 5VDC signal that's easily monitored by most building management systems
  • Solid state, needs no power and lasts for 50,000 hours or more
  • No need to shut lights off, enter a plenum or trigger a door switch
  • Rated up to 5 amps per connection
  • 5-year product warranty
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