Mine Ventilation Fans

Mine Ventilation Fans (HMZOP)

Location: San Jose, CA 95120 Santa Clara County
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Country: United States of America
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N 37° 10.394', W 121° 49.583'

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Inscription
Ventilation fans provided fresh air for miners deep within the mines. Ventilation pipe connected to fans carried air wherever it was needed in the mine to provide miners with breathable air by diluting and displacing dust and noxious gases. Fans were designed to run continuously with little or no maintenance. Fans were normally mounted on platforms well clear of the mine entrance and far away from equipment traffic so as to provide the cleanest and coolest air possible.

Examples shown here are centrifugal fans, also known as radial fans. The rotation of an impeller, located within the casing, causes air to travel through it in a radial direction, developing air pressure as it does so. These two examples are rather simple in design, as they do not provide for speed or air volume control. Electricity to power the ventilation fans was a major cost factor, accounting for as much as one-third of the electrical power for a typical underground mine.

These fans were used in the Guadalupe mine from the 1940s until the mine closed in the 1970s. The Guadalupe Rubbish Company donated the fans to NAQCPA in 1987.
Louis Allis Centrifugal Fan (on the left)
Manufacturer: The Louis Allis Co., Milwaukee, WI
Power: 220/440V, 3 [ohms], 60 Hz, 26.4/13.2A, 10 HO
Output: 100 CFM @ 40 PSI
Joy Centrifugal Fan (on the right)
Manufacturer: Joy Manufacturing Co., New Philadelphia, Ohio
Power 220/440V, 3 [ohms], 60 Hz, 63/31.5 A, 25 HP
Output: 200 CFM @ 41 PSI
Details
HM NumberHMZOP
Series This marker is part of the Daughters of the American Revolution series
Tags
Placed ByThe California State Society, Daughters of the American Revolution and New Almaden Quicksilver County Park Association
Marker ConditionNo reports yet
Date Added Saturday, October 4th, 2014 at 7:34pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10S E 604188 N 4114734
Decimal Degrees37.17323333, -121.82638333
Degrees and Decimal MinutesN 37° 10.394', W 121° 49.583'
Degrees, Minutes and Seconds37° 10' 23.64" N, 121° 49' 34.98" W
Driving DirectionsGoogle Maps
Area Code(s)408
Closest Postal AddressAt or near 115 Deep Gulch Trail, San Jose CA 95120, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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