If rack space does not allow for this then the m108s can me mounted with a space in between every two
units. In this configuration each preamplifier has one top or bottom surface exposed to ambient air.
If it is necessary to mount multiple m108s in a rack without spaces in between them there should be
forced air ventilation in the rack cabinet to ensure adequate cooling. This type of mounting is not
recommenced unless the rack is located in a climate controlled environment, i.e. not outside in the hot
sun.
m108 Owner's Manual
page 9