The FAP-LP (Low Pressure) is the original model in the Frazier Air Permeability family of testers. This is the most basic model in terms of price and testing ranges. The testing resolution and calibration procedures are the same as all the other models.
The FAP-LP has a differential pressure range (delta P or Pressure Drop) of 0" to 1.0" inches of water pressure (0 to 250 Pascals or 0 to 25 mm). The Air Flow range is up to 700 CFM/SF (213 CMM/SM).
If you are looking for a unit with extended ranges, see the FAP-HP or if you need a tester that is computerized, see the FAP-F2