HP Jet Fusion 4200 Product Documentation Site Preparation Manual page 20

Take measurements at 4 different points of the hose perimeter as shown in the following picture, and also take a
measurement at the center of the hose. Always take measurements close to the end of the hose, where it
connects to the printer air exhaust kit, and make sure the anemometer wheel is perpendicular to the direction of
the air flow.
For each of the measurement points, take 5 different measurements, find the minimum and maximum values,
and calculate their average. Finally, calculate the average of all 5 measurement points. Results should be within
specifications according to the numbers provided previously. If one of the 5 measurement points is much lower
than the other 4, this could indicate a problem with the exhaust hoses. For example, that the hose is not straight
and bends at some point along its path.
Important airflow notes
Too much or too little aspiration flow and/or pressure may influence the printing process, affecting the part
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quality. Too little aspiration may lead to lack of temperature control and health issues with some printing
materials. See materials safety data sheet for more details. Too much aspiration produces a waste of
conditioned air from the room. Unbalanced aspiration may cause problems with the temperature of the
material.
Air recirculation in air-conditioning systems may cause health issues with some printing materials. The
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extracted air should be eliminated and clean air should be introduced into the room to replace it.
16 Chapter 2 Site preparation requirements for the printer ENWW