Draft Details

Designation:Z21.66/CSA 6.14
Contact:Pam Marvinney
Contact name:[email protected]
Review start date:Feb 13, 2023
Review end date:Apr 14, 2023
Contact email:kelly.yaremko(at)csagroup.org
Draft Scope/Description:

1.1 Applications

This Standard applies to the construction, performance, and installation procedures for a newly produced automatic damper device (hereinafter referred to as device) constructed entirely of new, unused parts and materials and designed to be used with a gas-fired appliance listed by a nationally recognized certification body.


1.2 Inclusion

This Standard applies to the following automatic damper devices:



Fireplace chimney; and

Backflow prevention

Rationale: There currently are no component standards that cover flue damper devices or backflow dampers.

Flue damper devices have been in use for decades, and have typically been tested and certified to ANSI Z21.66 • CSA 6.14 by many nationally recognized certification bodies. This proposal is intended to correct unintentional omissions in the ANSI Z21.66-2015 • CSA 6.14-2015, and provide coverage for an existing gap in performance and construction requirements.

 A backflow damper is designed to prevent flue gas from entering into idle appliances when part of a positive pressure common vent system.

These types of systems are becoming more commonly used in North America. Currently, there are no standards that cover the construction and performance requirements for these devices.

                                The CSA B149.1-20 draft edition includes a proposal to require backflow dampers - look up the clause number, proposed language, and rationale statement for that proposal.

1.3 Publications

Clause 2 contains a list of standards specifically referenced in this Standard and sources from which these reference standards may be obtained.

1.4 Construction

Additional provisions specific to electrically operated automatic vent damper devices are outlined under Clause 4.

1.5 Retrofit Installation

Additional provisions specific to retrofit automatic vent damper devices are outlined under Clause 10

1.6 American Provisions

Clause 13 contains provisions that are unique to the United States.

1.7 Canadian Provisions

Clause 14 contains provisions that are unique to Canada.

1.8 Gage Pressure

All references to “psi” throughout this Standard are to be considered gage pressures unless otherwise specified.

1.9 Unit of Measure

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

1.10 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

You may comment on any section of this document by clicking the “Submit Comment” link at the bottom of the relevant section.