Anti-frost fan

Details Anti-frost fan Anti-frost fan

1987-05-19

1988-06-28

Hafer, Robert A.

Plant husbandry

Frost preventing

A01G 1300

Patent

active

047530340

ABSTRACT:
A vertical-axis centrifugal fan is operated in an orchard or crop area to draw warm upper air downward, and urge it laterally outward to displace lower strata of cold air to prevent freezing. The rotor is axially open on top, and closed on the bottom to establish this flow without ducting.

REFERENCES:
patent: 1165931 (1915-12-01), Akimoff
patent: 1568946 (1926-01-01), Generich
patent: 2165148 (1939-07-01), Nelson et al.
patent: 2980990 (1961-04-01), Sprouse
patent: 3656643 (1972-04-01), Keneson et al.
patent: 3847505 (1974-11-01), Tresse
patent: 4501089 (1985-02-01), Cobden

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