Ventilation – Having inlet airway – Including specific air distributor
Reexamination Certificate
2005-10-11
2005-10-11
Joyce, Harold (Department: 3749)
Ventilation
Having inlet airway
Including specific air distributor
C138S040000, C454S903000
Reexamination Certificate
active
06953396
ABSTRACT:
A fabric flow restriction and method for conveying a volume of air through a fabric duct prevents the violet popping that may occur with a fabric duct upon start-up. The fabric ducts are air permeable and/or include discharge openings that evenly disperse supply air from within the duct to a room being heated, cooled, ventilated, or otherwise conditioned by the air. The ducts are typically in a collapsed positioned prior to blower start-up. With the initial airflow, the ducts quickly fill with air and may make a popping sound at their distal ends as the airflow fills the entire fabric duct. The flow restrictions disclosed may be formed of a flexible fabric that has an airflow resistance that varies with radius across the flexible fabric. The flow restrictions may have a first region and a second region each with different resistances, for example. Varying the resistance across the fabric flow restriction reduces or eliminates the popping condition. The condition may also be eliminated by using a uniform resistance flow restriction that has a high resistance during start-up and a low resistance during normal operation.
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Gebke Kevin J.
Paschke Nicolas B.
Joyce Harold
Rite-Hite Holding Corporation
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