Honeywell CL48PM Owner's Manual page 6

USER TIPS
The recommended maximum relative humidity level is 60% or
less, which allows a noticeable temperature decrease. The
temperature decrease will be greater in drier climates
because higher evaporation occurs when the humidity is low.
The evaporative air cooler should not be used in enclosed
spaces. It must be kept level and there must be water in the
water tank. The room should have doors and windows
opened to allow free air flow. The evaporative air cooler works
best when placed near an open window, so that outside air is
drawn into the evaporative air cooler, the air circulates in the
room, then exits via the door. The maximum cooling effect is
felt when a person is in the flow of air coming out of the
evaporative air cooler.
The evaporative air cooler can also be used to humidify dry
air during cool weather. To be used for humidification the
windows and doors should be closed to allow the humidified
air to accumulate.
NOTE
When the product is used for the first time the Honeycomb Cooling Media will have an odor
which will dissipate in a week or so of initial use.
4
Room with open windows & door
(RECOMMENDED)
Room with closed windows & door
(NOT-RECOMMENDED)