Multi-head prefabricated wall panel fire sprinkler

A modular building unit comprising:

• a prefabricated wall panel abutting a first room and a second room;
• a first portion of pre-installed fire sprinkler pipe routed vertically within the prefabricated wall panel;
• a second portion of pre-installed fire sprinkler pipe perpendicular to the first portion of pre-installed fire sprinkler pipe, a first end of the second portion of pre-installed fire sprinkler pipe extending into the first room and a second end of the second portion of pre-installed fire sprinkler pipe extending into the second room;
• a first fire sprinkler coupled to the first end of the second portion of pre-installed fire sprinkler pipe, the first fire sprinkler positioned such that an above-threshold portion of the first room is within a spray range of the first fire sprinkler;
• and
• a second fire sprinkler coupled to the second end of the second portion of pre-installed fire sprinkler pipe, the second fire sprinkler positioned such that an above-threshold portion of the second room is within a spray range of the second fire sprinkler.