Owner's manual

Page 93 of 197
Inflow Velocity Calculation - Secondary Method
If the primary method cannot be performed, the secondary inflow calculation method
should be used. The secondary method uses a hot wire thermal anemometer. In this
method, the sash is lowered, and a series of velocity readings are taken at the front of
the unit.
NOTE: You must use Labconco holder P/N 3836405 to perform this test
properly. Qualified certifiers can obtain this holder as part of the Logic
Certifier Kit.
For each model Purifier, the sash should be closed until the distance from the bottom
edge of the sash to the mating surface of the grey corner post end cap, equals
“Restricted Sash Opening” as shown Table 6-5 below. The measurement should be
taken using the appropriate marked template as shown below in Figure 6-9 below.
The thermal anemometer probe should be positioned such that the distance from the
bottom of the probe holder to the center of the sensor element equals “Sensor Distance”
as shown in Table 6-5 below. Use the marks on the 6-foot templates, or a scale as
shown in Figure 6-10a & b below.
Figure 6-9
Measuring the restricted access
opening height, using the
appropriate template. Ensure that
the bottom of the template is
seated in the sash stop.