Page 160 - FanPedia - By Twin City Fan and Blower

FAN-PEDIA SPARK RESISTANT

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Twin City Fan & Blower CONSTRUCTION
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CENTRIFUGAL FANS

AMCA Type C

Type C offers a minimal level of spark resistance and only requires that
possible contact between stationary and rotating components be reduced.

2 1 Typically, this construction includes the use of an aluminum inlet cone and
an aluminum rub ring. The aluminum inlet cone will be the first point of
fan wheel contact if there is a mechanical failure. The aluminum rub ring
placed at the opening of the housing where the shaft passes, protects
against contact of the steel fan shaft and steel fan housing.

NON-FERROUS CONSTRUCTION
Type C - INLET FUNNEL (MATERIAL VARIES)

1 RUB PLATE
rub plate also know as
STRIKER PLATE, SPARK PLATE
2 RUBBING BAND (RIVETED)
3 - RUB RING
STEEL CONSTRUCTION
- HOUSINGS / FRAME
2
- FASTENERS
1 - PEDESTAL
- WHEEL / IMPELLER

3 - SHAFT
NOTE: BEARINGS NOT ALLOWED IN AIRSTREAM

Type C Typical Non Ferrous Materials
-Aluminum
(With Piezometer Ring) -Aluminum/Nickel/Bronze
-Monel
-Copper
Construction varies by model. -Brass
-Bronze
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