Section 890.5940 - Chilling unit(a)Identification. A chilling unit is a refrigerative device intended for medical purposes to chill and maintain cold packs at a reduced temperature.(b)Classification. Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter, subject to the limitations in § 890.9 48 FR 53047, Nov. 23, 1983, as amended at 61 FR 1125, Jan. 16, 1996; 66 FR 38818 , July 25, 2001