Standard and Custom Filter Fan
Units (FFU's)
Standard units come in 3 basic sizes, nominal 2'X2', 2'X3' and 2'X4'.
The standard units come in 3 basic sizes
- 23 5/8”W
X 23 5/8”L X 9”H (nominal 2’ X
2’)
- 23 5/8”W X 35 5/8”L X 9”H
(nominal 2’ X
3’)
- 23 5/8”W X 47 5/8”L X 9”H (nominal
2’ X
4’)
For sizes other than the 3 standard ones, the customer selects
their preferred size. The sizing tolerance of the FFU can either
be designed to +0”/- 1/8” or +/- 1/16”, depending
on the mounting detail. Information about picking the tolerance
of the FFU would be designed to is contained in the following
passage titled “true
sizing versus military sizing” (doc).
Options
Custom sizes
Space on the top of production tools is very valuable and so
most Fan Filter designs are customized to the exact size required,
to maximize space utilization. The smallest FFU we currently
have in production is 8”W X 8”L X 9”H. Smaller
units, down to 4” X 4”, could be designed but would
have very limited air output capacity. The largest unit we have
in production is 24”W X 84”L X 13”H, however
larger units could be made.
|
