US 11,746,796 B1
Plenum fan with telescoping blades
Ionel Petrus, Silver Spring, MD (US); and Elena Gowdy Charming, Arlington, VA (US)
Assigned to SMITHGROUP COMPANIES, INC., Detroit, MI (US)
Filed by SmithGroup Companies, Inc., Detroit, MI (US)
Filed on Nov. 10, 2022, as Appl. No. 18/54,331.
Int. Cl. F04D 29/30 (2006.01); F04D 29/28 (2006.01); F04D 17/16 (2006.01)
CPC F04D 29/30 (2013.01) [F04D 17/16 (2013.01); F04D 29/281 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A fan comprising:
a housing defining a gas outlet for the fan;
a pair of opposing parallel plates disposed within the housing and being configured to rotate about an axis, one of the plates being configured to move toward and away from the other of the plates along the axis;
a plurality of first fan blades fixedly secured to and extending perpendicularly from a face of one of the plates; and
a plurality of second fan blades fixedly secured to and extending perpendicularly from a face of the other of the plates, the faces being adjacent to each other, each of the second fan blades being configured to receive a corresponding one of the first fan blades as the one of the plates moves toward the other of the plates, and the second fan blades being arranged to surround a gas inlet for the fan that is in fluid communication with the gas outlet.