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Optional Construction<br />
Spark Resistant Construction<br />
Fan applications may involve the handling of potentially<br />
explosive or flammable particles, fumes or vapors.<br />
Such applications require careful consideration by the<br />
system designer to insure the safe handling of such<br />
gases. Twin City Fan & Blower offers the following<br />
classifications of spark resistant construction per<br />
AMCA Standard 99-0401-86. It is the specifier or the<br />
user’s responsibility to specify the type of spark resistant<br />
construction with full recognition of the potential<br />
hazards and the degree of protection required.<br />
Type A All parts of the fan in contact with the<br />
airstream must be made of non-ferrous<br />
material — usually aluminum and limited to<br />
250°F operation.<br />
Type B The fan shall have a non-ferrous wheel and<br />
non-ferrous ring about the opening through<br />
which the shaft passes — usually aluminum<br />
wheel and rub ring and limited to 250°F<br />
construction.<br />
Type C The fan shall be so constructed that the<br />
shift of the wheel or shaft will not permit<br />
two ferrous parts of the fan to rub or strike.<br />
This is accomplished with an aluminum<br />
inlet cone and rub ring. This construction is<br />
limited to 500°F. Construction to 800°F is<br />
available using a steel inlet cone with copper/bronze<br />
lining.<br />
Notes:<br />
1. Bearings shall be placed outside the airstream.<br />
Therefore, do not use Arrangement 3 or 7.<br />
2. The user shall electrically ground all fan parts.<br />
Refer to the above listed AMCA standard for full<br />
details<br />
Split Housings<br />
All fans are designed to permit wheel removal through<br />
the fan inlet. To suit installation as well as transportation<br />
requirements, Twin City Fan & Blower offers<br />
horizontal split, pie-shaped, as well as other special<br />
split housing designs. Pie-shaped split housings allow<br />
fan wheel and shaft removal without disconnecting<br />
ductwork.<br />
Fan with pie-shaped split housing, raised<br />
access door and insulation pins.<br />
Swingout Construction<br />
Swingout fans are ideal for applications requiring<br />
frequent cleaning and inspection of the fan wheel<br />
and interior of the housing such as found in spray<br />
painting booth exhaust. Refer to Bulletin GA200 for<br />
other types of easy access fans offered by Twin City<br />
Fan & Blower.<br />
Special Metals<br />
To suit the demanding applications of today’s industry,<br />
Twin City Fan & Blower offers a variety of material<br />
for construction, including aluminum and stainless<br />
steel. We offer AWS and ASME certified welding<br />
procedures and welding technicians to assure quality<br />
construction when using special metals as well.<br />
6<br />
Twin City Bulletin 370
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