Labconco Hooded Combination (Macro) Kjeldahl Systems 21178 Series - Manual (Page 14)

Chapter 2: Installation
Product Service 1-800-522-7658 10
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 exhaust piping assembly is supplied with a short
piece of 6" PVC pipe and a flexible coupling with clamps to connect to the
dedicated duct work exhaust. The flexible coupling must be sealed air-tight to the
exhaust duct work.
All exhaust duct work must be acid-resistant and sealed air-tight. Use only acid-
resistant sealant on duct work joints.
The bottom of the piping assembly is fitted with a condensate drain and corrosion
resistant tubing. This condensate (identified 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).
Figure 2-6
Flexible 6”
Coupling
Damper
Piping
Assembly
Drain Line