Humidifier tub for humidifier for positive airway pressure delivery device

FIG. 1 is a perspective view of a humidifier tub for a humidifier for a positive airway pressure delivery device according to our new ornamental design.

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines in the drawings show environment or structure and do not form part of the claimed design.