Forma Scientific, Inc.________________________________________________Parts Lists
12-3
Model 1291
The parts for the Model 1291 are the same as the Model 1286 with the addition of:
420098 Transformer, 12VA, 115V primary / 12.6V secondary
420057 Transformer, 175VA, dual primary / dual secondary
*Filter Pressure Drop Conversion
Pressure drop across a HEPA filter is linear which allows one to accurately predict the
pressure drop at various cfm if given a starting value. It is a straight proportion from one
setting to the other.
Example:
A filter rating of .31” of water at 352 cfm needs to be converted to 530 cfm.
The formula is as follows:
.31 = x
352 530
Solving for x (the needed pressure drop at 530 cfm)
x=(.31 )*530
352
x=.47” of water (rounded)
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