CSA ANSI Z21.91:2017 pdf download.Ventless firebox enclosures for gas-fired unvented decorative room heaters.
1.1
CSA ANSI Z21.91 applies to newly produced ventless firebox enclosures (see Clause 3, Definitions), herein after referred to as fire boxes, for unvented decorative room heaters.
1.2
Fireboxes covered by this Standard are intended for use with unvented decorative room heaters that comply with ANSI Z21.11.2 for installation in solid fuel-burning fireplaces.
1.3
If a value for measurement as given in CSA ANSI Z21.91 is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.
1.4
All references to “psi” throughout this Standard are to be considered gauge pressures, unless otherwise specified.
1.5
In CSA ANSI Z21.91, “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 (nonmandatory) to define their application.
2 Reference publications
CSA ANSI Z21.91 refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto.
American Gas Association
ANSI Z223.1-2015/NFPA 54-2015
National Fuel Gas Code
American National Standards Institute, Inc.
ANSI Y14.15-1966 (R1988)
Electrical and Electronic Diagrams
Institute of Electrical and Electronic Engineers
ANSI/IEEE 315-1975 (R1994), and Supplement, ANSI/IEEE 315A-1986
Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Class Designation Letters)
National Electrical Manufacturers Association (NEMA)
ANSI Z535.1-2006 (R2011)
Safety Color Code
ANSI Z535.4-2011
Product Safety Signs and Labels
National Fire Protection Association
ANSI/NFPA 70-2014
National Electrical Code
NFPA 54-2015/ANSI Z223.1-2015
National Fuel Gas Code
Underwriters Laboratories Inc.
ANSI/UL 62-2014
Flexible Cords and Cables
ANSI/UL C1O1-2002
Leakage Current for Appliances
UL 127-2011
Factory-Built Fireplaces
3 Definitions
The following definitions shall apply in CSA ANSI Z21.91:
Baffle — an object placed in an appliance to change the direction of, or retard the flow of air, gas-air mixtures, or flue gases.
Base — the lowest supporting frame or structure of the appliance, exclusive of legs.
BTU — abbreviation for British Thermal Unit. The quantity of heat required to raise the temperature of 1 pound of water 1°F.CSA ANSI Z21.91 pdf download.