FIG. 1 is a front perspective view of a ventilation interface portion of a ventilation apparatus showing our new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a right side perspective view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a rear perspective view thereof;

FIG. 6 is a bottom perspective view thereof; and,

FIG. 7 is an enlarged front perspective view of the claimed ventilation interface portion.

The broken line showing of the ventilation interface portion of a ventilation apparatus is for illustrative purposes only and forms no part of the claimed design.