Optionally, the enclosure 400 also comprises a filter 460 to filter debris. In one embodiment, the filter 460 is a HEPA filter. The filter 460 may be disposed on an upper base plate of the frame 434, a lower base plate of the frame 434, or the frame 434. The activity of the filter 460 may be controlled by the controller 452. For example, if a detected level of debris is high, the controller 452 may increase an activity level of the filter 460 (e.g. a heavy-duty mode). In contrast, if a detected level of debris is low, the controller 452 may decrease an activity level of the filter 460 (e.g. a light-duty mode). As another example, the filter 460 may be disposed at an inlet of the first vent 454. The controller 452 may further monitor a condition of the filter 460 to determine when it should be replaced.