12
IMM AGS-2
Case 5, Pit/Solid Wall Installation
Pit installations can cause operating problems and great care must be exercised if they are
to be used on an installation. Recirculation and restriction can both occur. A solid wall
surrounding a unit is substantially the same as a pit and the data presented in this case
should be used.
Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit.
The grating material and installation design must be strong enough to prevent such
accidents, yet provide abundant open area or serious recirculation problems will occur.
Have any pit installation reviewed by the McQuay sales office prior to installation to
discuss whether it has sufficient airflow characteristics. The installation design engineer
must approve the work and is responsible for design criteria.
Figure 12, Pit Installation
Figure 13, Adjustment Factor
