초록 ▼

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 moist

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.

대표청구항 ▼

In a roof vent structure for use with a heat weldable, impermeable plastic membrane roof covering an underlying surface; a. an elongate, essentially hollow, imperforate, vertical tube having an air outflow opening at its upper end and an air inflow opening at its lower end; b. means for supporting t

In a roof vent structure for use with a heat weldable, impermeable plastic membrane roof covering an underlying surface; a. an elongate, essentially hollow, imperforate, vertical tube having an air outflow opening at its upper end and an air inflow opening at its lower end; b. means for supporting the lower end of said tube within an opening cut in said membrane; c. means incorporated with said tube for permitting vapor flow into the interior of said tube from under the membrane material; d. a cap for said tube having a side wall and a top wall, the top wall being spaced upwardly from the top of said tube to form a lateral space above and communicating with the interior of the tube; and e. circumferentially spaced fin means, incorporated with said vent structure in said lateral space, creating circumferentially segregated horizontally extending venturi passages in vertical alignment with said air outflow and inflow openings to enhance the pull of moisture-laden air from said tube on windy days.