Labconco Open Combination (Macro) Kjeldahl Systems 21237 Series - Manual (Page 14)

Chapter 2: Installation
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Acid Fume Blower Exhaust System
The exhaust duct connection on top of the blower is sized for use with 6" nominal
(6-5/8" O.D.) vent duct. The blower assembly is supplied with a short piece of 6"
PVC pipe and a flexible coupling with clamps to connect the blower housing
assembly to the duct work exhaust stack.
Joints under the flexible coupling must be sealed with an acid-resistant sealant
(silicone or acid resistant cement) before tightening clamps to prevent leakage of
acid condensate at this point.
The bottom of the blower housing is fitted with a condensate drain and corrosion
resistant tubing. This condensate (identified by “A” above and on the next page)
can be collected in a closed acid proof container, which should be emptied
regularly or it may be plumbed to an acid resistant drain line. The condensate is
concentrated acid and care must be exercised when handling it.
Blower Airflow Exhaust Volume Requirement &
Velocity Test
Cubic feet per minute = 25
Average airflow velocity = 117 feet per minute
The Kjeldahl’s blower airflow volume test is based on the "Pitot Traverse in Inlet
Duct" method described in the ANSI/ASHRAE 51-1999 standard. Duct velocity
measurements are taken at 48" from the blower using a 6 point duct traverse
pattern (Industrial Ventilation 24th Edition p. 9-10).
A
Acid
Condensate
Drain Tube
Sealant PVC
Coupling
Flexible
Coupling
Figure 2-6