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 few
hours or so of initial use.
4
Room with open windows & door
(RECOMMENDED)
Room with closed windows & door
(NOT-RECOMMENDED)