Patent ID: 8747506
Filing Date: 2014-06-10
Classification: B01D

Abstract:
1. An air pre-filtration unit comprising: a frame including a filter portion and a spacer portion, the filter portion located on an upstream side of the air pre-filtration unit and including an air pre-filter, and the spacer portion attached to the filter portion via the frame and extending downstream, in a downstream direction, from the filter portion; a first retainer that is connected to the frame and that separates the filter portion from the spacer portion; and a second retainer that is connected to the frame, that delimits the spacer portion in the downstream direction, and that provides an at least partially open end located on a downstream side of the spacer portion to expose a downstream face of the air pre-filter, wherein each of the first and second retainers includes a structure that includes a plurality of members that span respective first and second cross-sections of the air pre-filtration unit such that the cross-sections are partially open to allow airflow to pass therethrough.