Does Reference in a Standard Pull in Other Code?

I have a project involving spray application of resin, and an exhaust system including multiple 60-ft tall exhaust stacks.

We are located in Ontario Canada, and the Ontario Building Code takes precedence. Any other codes cited need to be enacted by the OBC, or by a code enacted by OBC in order to be relevant. NFPA 13 is relevant here.

Chapter 26 (NFPA 13-2019) includes material from other codes. Section 26.4 relates to Spray Application Using Flammable or Combustible Materials, and references NFPA 33.

I have not found a reference in NFPA 13 that states that an in-duct sprinkler system SHALL be provided.

It appears to me that Section 26.4 states requirements for IF a system is provided.

Unless otherwise stated, are the requirements of Chapter 26 to be used in isolation, without enacting the full text of the other NFPA Code/Standard cited?

If another NFPA Code/Standard is cited in Chapter 26, is the full text of the cited document to be followed?

Where is the line drawn between the two documents?

I have the NFPA 13 Handbook, and the supplemental text does not clarify this for me. Thank you very much for taking the time to read through this one.

​