Portable ventilating apparatus for purging underground installat

Details Portable ventilating apparatus for purging underground installat Portable ventilating apparatus for purging underground installat

1978-03-13

1981-08-25

Favors, Edward G.

98 49, 98 40C, 98 40N, F24F 1300

Patent

active

042852692

ABSTRACT:
This invention relates to a portable ventilating apparatus particularly well suited for use in purging underground installations characterized by a collar having a deflector atop thereof mountable within an entryway on the surface leading below ground, a duct hanging from the underside of the collar extendable well down into the area to be ventilated in spaced relation to the entryway so as to leave an annular exhaust passage therebetween, a tapered nozzle supported within the mouth of the collar cooperating with the deflector to define an annular air intake passage, and a blower mounted within the nozzle for directing a stream of air down the duct, said blower and nozzle cooperating to inspirate clean air into the duct through the air intake passage and using it to force any foul air out through the exhaust opening across the deflector which disperses it and thus prevents the latter from being returned underground.

REFERENCES:
patent: 73957 (1893-06-01), Stauber
patent: 592468 (1897-10-01), Harris
patent: 2291546 (1942-07-01), George
patent: 3610524 (1971-10-01), Wallen
patent: 3943329 (1976-03-01), Hlavac

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