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Masonry stove gas port

Posts: 14
Location: Linneus, Me.
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To the forum: I refer to a publication, “The Missouri Designed Masonry Stove,” https://energy.mo.gov/sites/energy/files/pub781.pdf  I intend to build this stove and I have a question. (Their contact info either does not work or they simply do not have the resources to respond).

Page 13 advises inclusion of a safety gas port: "Installation of Gas Port for Safety: On vertical flue stoves, it is a good safety measure to allow a 1" x 2" gas escape port at the top of the hanging flue run to avoid any explosive gas build-up that may arise because of improper stove operation, such as burning the fire too slow, or closing down the stove too soon, or improper damper operation."

I have never seen such a safety port included in a masonry stove.  I traveled in Europe and had the opportunity to see several masonry stoves (both vertically and horizontally flued) and to talk with experienced builders of masonry stoves, and no one has ever included or mentioned this safety mechanism.  Indeed, since deciding to build the Missouri stove, I cannot find anyone who seems to have much of any idea at all regarding the inclusion of a gas port.  My own attempt to research this aspect has brought zero results.  I just want to be able to understand it more for myself and for others who I am sure will be building the Missouri stove.  In particular, I would like to better understand why there is no need for this safety port in horizontal flues and why there is no need for more than one safety port in a stove that has several levels of flues.  Can anyone on this forum edify me?  Thank you.
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