Effective January 1, 2017

Standard Information
Standard Number:
UL 921/ANSI Z83.21/CSA C22.2.168
Standard Name:
Commercial Dishwashers
Standard Edition and Issue Date:
7th Edition Dated March 23, 2016
Date of Previous Revisions to Standard:
6th Edition Revised July 6, 2012
Effective Date of New/Revised Requirements

Effective Date (see Schedule below): January 1, 2017

Impact, Overview, Fees and Action Required

Impact Statement: A review of all Listing Reports is necessary to determine which products comply with new/revised requirements and which products will require re-evaluation. NOTE: Effective immediately, this revised standard will be exclusively used for evaluation of new products unless the Applicant requests in writing that current requirements be used along with their understanding that their listings will be withdrawn on Effective Date noted above, unless the product is found to comply with new/revised requirements.

Overview of Changes: The seventh edition of the Standard for Commercial Dishwashers, UL 921, includes the addition of Supplement Section for Commercial Dishwashers Incorporating Self-Contained Condensing Systems. Specific details of new/revised requirements are found in table below.

If the applicable requirements noted in the table are not described in your report(s), these requirements will need to be confirmed as met and added to your report(s) such as markings, instructions, test results, etc. (as required).

Schedule: So that shipping of products with Listing Marks will not be interrupted, an approximate schedule has been established to ensure Listing Reports are found compliant by Effective Date:

  • May 2, 2016 = 8 Month Report Review – Intertek will review all Reports. Update if compliance is verified or issue Findings Letter/Quote for any re-evaluations needed
  • July 1, 2016 = 6 Month Quote Cut-off – Quotes returned for necessary re-evaluations
  • January 1, 2017 = Effective Date – ATM Suspended for all non-compliant Reports

Fees: An initial review of Listing Report (s) will be covered by a direct billing project and will be invoiced at not more than $1000 per report.

Client Action Required:

Information – To assist our Engineer with review of your Listing Reports, please submit technical information in response to the new/revised paragraphs noted in the attached or explain why these new/revised requirements do not apply to your product (s).

Current Listings Not Active? – Please immediately identify any current Listing Reports or products that are no longer active and should be removed from our records. We will do this at no charge as long as Intertek is notified in writing prior to the review of your reports.

Description of New/Revised Technical Requirements
 New section added;


This new section includes new construction requirements, performance test requirements, and markings for Commercial Dishwashers Incorporating SelfContained Condensing Systems (see standard for section details).
SA1InfoThese requirements cover commercial, freestanding dishwashers which incorporate a self-contained condensing system to capture heat and water vapors, thereby reducing the residual heat gain to the premises. These requirements add to the applicable requirements in the body of this Standard.
SA1.2InfoThese requirements do not apply to:

a) Under-counter-type commercial dishwashing machines;

b) Low-temperature [not greater than] 140°F (60°C) commercial chemical-type dishwashers; and

c) Gas-fired dishwashers.

CUSTOMERS PLEASE NOTE: This Table and column "Verdict" can be used in determining how your current or future production is or will be in compliance with new/revised requirements.

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