New Plenum Electrical Boxes are cULus Listed

Press Release Summary:

  • Available in 15 models and are offered in three different box styles 4 in. square, 4-11/16 in. square and 4 in. octagon
  • Used in ceiling applications where air-tight enclosures are required, for use in air returns or required by code
  • Constructed of drawn steel and are ideal for commercial, institutional and residential markets

Original Press Release:

RACO Expands Plenum Electrical Box Line

South Bend, Indiana June 23, 2020 - RACO introduces an expanded line of electrical boxes designed for plenum applications. These new products provide additional options for above-ceiling installations. RACO, part of Hubbell's Commercial Construction brands, provides innovative electrical products to commercial, institutional and residential markets.

RACO's new plenum rated boxes are used in above-ceiling applications where air-tight enclosures are required, for use in air returns or required by code. 15 new models are offered, including three different box styles-4" square, 4-11/16" square and 4" octagon. Two models feature shallow 1-1/2" depths. 

Knockouts on these new plenum boxes are airtight. The 4" square models provide a variety of ½" and ¾" knockout options. The 4" octagon models offer ½ and ¾" knockouts. The 4-11/16" square models offer knockouts that range from ½" to 1-1/4." 

These cULus Listed boxes are constructed of drawn steel. To maintain the plenum seal, no ground screw holes are provided. Also available are PVC foam gasketed flat blank covers and extension rings for the 4" and 4-11/16" square boxes. 

The company's plenum boxes maintain code-compliance in a variety of commercial and industrial applications. Availability of RACO's new Plenum Box Line begins July 2020. Find more information at

About Hubbell Commercial Construction
Hubbell's Commercial Construction business includes a suite of five brands that manufacture innovative, high-quality and cost-effective electrical products for a broad range of applications, including residential, commercial, industrial, OEM and MRO. RACO produces electrical boxes and fittings. TayMac creates "while in use" covers for outdoor electrical. Bell is the name contractors know for weatherproof boxes and covers. Wiegmann offers a complete line of electrical enclosures. Acme Electric manufactures power conversion and conditioning equipment.

Hubbell Incorporated is an international electrical and electronics manufacturer. The company's history of electrical innovation extends back to 1888. Founder Harvey Hubbell invented the pull chain light switch and the duplex receptacle. Corporate headquarters are located in Shelton, Connecticut.

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