Page 259 - FanPedia - By Twin City Fan and Blower

FAN-PEDIA

Published by TECHNICAL DESCRIPTIONS
Twin City Fan & Blower

©2017 TCF.COM

Arrangement 8 (Plug Fans)
Arr. 8 is a direct drive arrangement where the motor shaft is coupled to the fan shaft. The entire
assembly is mounted to the customer’s wall. This is the least common plug fan arrangement due to
the length of the assembly.

Arrangement 8P (Plug Fans)
Same as the arr. 8 fan except the fan is mounted to grade. Typically used on larger fans and/or larger
HP motors where the customer’s wall may not be sufficient by itself. Mounting to the foundation also
makes it better for meeting lower vibration requirements. Mounting panel is optional on arr. 8P.

Arrangement 9 (Plug Fans)
Arr. 9 is the most common plug fan arrangement. It is fully supported by the customer’s wall. Plug
fans are housed in the customer’s enclosure in applications where the system plenum acts as the fan
housing. Unlike the plenum fan, motor, shaft and bearings are outside of the process airstream.

Arrangement 9P (Plug Fans)
Same as the arr. 9 fan except the fan is mounted to grade. Typically used on larger fans and/or larger
HP motors where the customer’s wall may not be sufficient by itself. Mounting to the foundation also
makes it better for meeting lower vibration requirements. Mounting panel is optional on arr. 9P.

Arrangement 4 (Axial)
The direct drive Arrangement 4 is the logical choice when space is at a premium or a simple,
dependable fan with minimum maintenance is required. The fan wheel is mounted directly on the fan
motor shaft in this arrangement for a smaller overall size. Where exact performance of the system is
required, the user can adjust the blade angle to fine-tune the system and obtain the necessary flow.

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