UL 733 PDF
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Standard for Oil-Fired Air Heaters and Oil-Fired Direct-Fired Heaters
Oil-Fired Air Heaters and Direct-Fired Heaters
UL 733
1 Scope
1.1 These requirements apply to oil-fired air heaters and direct-fired heaters.
1.2 Requirements for the installation and use of oil-burning equipment are included in the Standard for the Installation of Oil-Burning Equipment, NFPA 31.
1.3 Deleted December 13, 2005
Summary of Topics
This new edition of UL 733 dated May 2, 2019 includes the following changes:
Change to the title and scope of standard
Update to the glossary terms
Clarify assembly requirements
Clarify construction requirements
Clarify marking requirements
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