Dectron, Inc. March 2012
Owner’s Manual
DSH/DSV/RSH/DBH/RBH Series Dehumidifier
Duct-Traversing Planes Building Construction
Data subject to change without notice.
BUILDING
CONSTRUCTION
35
This is not a convenience air conditioner - it is a process dehumidifier. Proper airflow is essential.
Be sure to arrange sections of the supply duct, the outdoor-air intake duct (if any), and the exhaust-air duct (if
any) for airflow measurement. The traversing plane for airflow measurement should be accessible and
1. full-sized, unbranched, and straight for at least three effective duct diameters upstream of the traversing plane,
or per ASHRAE 111-2008, whichever is greater, and
2. full-sized, unbranched, and straight for at least
one effective duct diameter downstream of the traversing
plane, or per ASHRAE 111-2008, whichever is greater.
For this purpose, the effective duct diameter E
L
is given by
E
L
= √ 4ab / π
duct-traversing plane
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