Secondary duct installation apparatus and method for a forced ai

Details Secondary duct installation apparatus and method for a forced ai Secondary duct installation apparatus and method for a forced ai

1994-11-18

1996-07-23

Arola, Dave W.

Pipe joints or couplings

With assembly means or feature

Guide and support

285424, 285189, 29428, F16L 3500

Patent

active

055382932

ABSTRACT:
Apparatus and method for installing a secondary duct to a main duct in a forced air ventilation system utilizes a gasket having a central opening which functions as a template for cutting an opening into the main duct after the gasket is secured to a flat surface of the main duct. The secondary duct is then inserted through the openings of the gasket and the main duct and is secured to the main duct and the gasket so as to seal the openings.

REFERENCES:
patent: 1106761 (1914-08-01), Weikert et al.
patent: 1661674 (1928-03-01), Osborn
patent: 2799518 (1957-07-01), Anderson et al.
patent: 3221572 (1985-12-01), Swick
patent: 3606404 (1971-09-01), McGann
patent: 4294476 (1981-10-01), Nash
patent: 4470606 (1984-09-01), Knowles
patent: 4491124 (1985-01-01), Goettel
patent: 4620729 (1986-11-01), Kauffman
patent: 5393106 (1995-02-01), Schroeder

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