[54] TERMINAL UNIT WITH ACTIVE DIFFUSER
[76] Inventor: Thomas B. Hartman, 9905 39th Dr., NE. Marysville, Wash. 98270-9116
[21] Appl. No.: 09/037,594 [22] Filed: Mar. 9, 1998
Related U.S. Application Data
[63] Continuation-in-part of application No. 08/586,337, Jan. 16, 1996, Pat. No. 5,725,148.
[51] Int. C I. G05D 23/13
[52] U.S. CI 236/13; 236/49.3; 454/269;
454/300
[58] Field of Search 236/13, 49.3; 454/269,
454/300, 303
[56] References Cited
U.S. PATENT DOCUMENTS
2,126,230 8/1938 Troxell, Jr. 454/269
2,189,008 2/1940 Kurth 454/300
2,217,944 10/1940 Collicutt 454/269
2,674,934 4/1954 Tutt 454/269
4,406,397 9/1983 Kamata et al. .
4,515,069 5/1985 Kline et al. .
4,545,524 10/1985 Zelczer .
4,646,964 3/1987 Parker et al. .
4,718,021 1/1988 Timblin .
In building environmental control, primary HVAC services are distributed to multiple terminal units. An active diffuser terminal unit has a variable speed lan to controllably draw room air into the unit for reheating the air; and, conversely, to force conditioned air down into the space for cooling by reversing the direction ol the lan motor. Variation ol the lan speed serves to modulate the airflow direction mix through a combination ol a vertical port and a horizontal port. This closed system avoids filtering plenum air, and reduces cost by supporting both heating and cooling services with a single lan.
7 Claims, 12 Drawing Sheets
