Negative pressure unit

Description

This invention was made with government support under Contract FA8650-13-12-6372 awarded by the Department of the Air Force. The government has certain rights in the invention.

FIG. 1 is an top front perspective view of a negative pressure unit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an top rear perspective view thereof.

The broken lines in the drawings illustrate portions of the negative pressure unit that form no part of the claimed design.

Claims

The ornamental design for a negative pressure unit, as shown and described.