What are the criteria for using an attached cord and plug on Glo-Ray® Infrared Strip Heaters (Foodwarmers)?

Cord and plug sets can be furnished provided the Strip Heater meets the following requirements: it must be a single housing only, with or without lights (duals are not allowed); the housing must be 72" (1829 mm) or less in width (longest dimension); the Strip Heater must be 120 volt; and the Strip Heater must be mounted as a portable unit (i.e., C-legs or T-legs).