The objective of this Standard is to provide manufacturers, installers and consumers with
means  for  determining  the  requirements  (including  clearances  from  heat-sensitive
materials) for the correct and safe installation of domestic solid fuel (wood) burning heating
appliances and their associated floor protectors and flue systems. This revision includes the
following:

(a)  Changes  to  the  minimum  clearance  requirement  for  heat  shields  for  an  untested
installation and new figures changes to the requirement for heat shields for a tested
appliance (see Clause 3.2).
(b)  Changes  to  the  minimum  clearance  requirement  and  minimum  thickness  for
continuous  heat-tolerant  material  for  an  untested  floor  protector  installation  
(see Clause 3.3.3).
(c)  Major revision to built-in appliance installation, including the addition of several new
figures (see Clause 3.4.2).
(d)  Change to stainless steel or Monel fasteners usage requirement to secure enamelled
and stainless steel sections.
(e)  Major changes to flues penetrating ceilings floors and walls including the addition of
new diagrams displaying requirements for untested flue penetration (see Clause 4.6).
(f)  Changes to the minimum horizontal radius to nearby structures (Clause 4.9.1).
(g)  The  addition  of  new  text  in  Appendix B,  Paragraph B8,  which  describes  the
requirements for testing water heating devices fitted to appliances.
(h)  The addition of several new diagrams in Appendix F, Paragraphs F7 and F8, which
display thermocouple placement requirements for testing.
(i)  Inclusion  of  a  number  of  minor  changes  and  additions  to  clarify  and  support  the
requirements and specifications of this Standard.

The installation requirements for untested appliances and flue systems apply from the date
of publication of this Standard.

Statements expressed in mandatory terms in Tables are deemed to be requirements of this
Standard. In this Standard, Notes are for information and guidance only.

The  term  ‘normative’  and  ‘informative’  have  been  used  in  this  Standard  to  define  the
application of the appendix to which they apply. A ‘normative’ appendix is an integral part
of a Standard, whereas an ‘informative’ appendix is only for information and guidance.

Originated in Australia as AS 2918-1987. Second edition 1990. Originated in New Zealand as NZS 7421:1972. Second edition 1985. Third Australian edition AS 2918-1990. Third New Zealand edition NZS 7421:1990. AS 2918—1990 and NZS 7421:1990 jointly revised, amalgamated and designated AS/NZS 2918:2001.