Roof vent structure for plastic membrane roofs

Details Roof vent structure for plastic membrane roofs Roof vent structure for plastic membrane roofs

1989-03-01

1990-03-20

Joyce, Harold

52199, 98 78, 98 83, 98122, F24F 702

Patent

active

049091352

ABSTRACT:
A vent structure for use with plastic membrane roofs has an elongate vertical tube with a base flange to which membrane material may be heat welded. An overhanging tube cap has generally radially extending, vertical, venturi passage-creating fins which converge inwardly and enhance the pull of moisture entrained air from the tube when wind currents blow between the cap and upper end of the tube.

REFERENCES:
patent: 230952 (1880-08-01), Mark
patent: 1394735 (1921-10-01), Jordan
patent: 3509811 (1970-05-01), Topp
patent: 3685426 (1972-08-01), Rosa
patent: 4399743 (1983-08-01), Izzi, Sr.
patent: 4484424 (1984-11-01), Logsdon
patent: 4652321 (1987-03-01), Greko

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