Exhaust vent hoods for marine vessels and related methods

A vent hood for collecting exhaust from a marine vessel, the vent hood comprising:

• a housing defining an enclosure, the housing including an opening into the enclosure;
• an engagement adjustment assembly configured to adjust a size of the opening;
• and
• a seal configured to engage with an outer surface of an exhaust stack of the marine vessel when the housing is lowered onto the exhaust stack, the seal being positioned at least partially within the enclosure and connected to the engagement adjustment assembly such that the seal surrounds the opening and expands and contracts as the engagement adjustment assembly adjusts the size of the opening.

A method of collecting exhaust from a marine vessel, the method comprising:

• (a) lowering a vent hood over an exhaust stack of the marine vessel, the vent hood including a housing having a frame and an outer cover that covers the frame to define an enclosure, the frame including one or more extendable frame members, and the enclosure having an opening;
• (b) adjusting a length of the one or more extendable frame members to adjust a size of the opening;
• (c) inserting the exhaust stack into the opening;
• and
• (d) receiving the exhaust emitted from the exhaust stack into the enclosure.

A method of collecting exhaust from a marine vessel, the method comprising:

• (a) lowering a vent hood over an exhaust stack of the marine vessel, the vent hood including:
• a housing defining an enclosure and having an opening into the enclosure,
• an engagement adjustment assembly, and
• a seal positioned at least partially within the enclosure;
• (b) expanding or contracting a size of the opening with the engagement adjustment assembly;
• (c) expanding or contracting the seal with the opening during step (b);
• and
• (d) engaging the seal with an outer surface of the exhaust stack to prevent exhaust from flowing out of the enclosure via the opening.