48 C.F.R. § 846.471 – Food service equipment.

(a) All new food service equipment purchased for Dietetic Service through other than the Defense General Supply Center sources must meet requirements set forth by NSF International (NSF) at http://www.nsf.org.
(b) The contracting officer will ensure that the following language is placed in the solicitation to assert that the equipment meets NSF standards:
The Government will accept an affixed NSF label and/or documentation of the NSF Certification from the contractor as evidence that the subject equipment meets NSF Sanitation standards.