Prem-I-Air PAC1130 Instruction Manual page 17

Air Exhaust Dust Installation
For window use the fish tail fitting, rather than the square fitting.
The following methods should be used to exhaust the hot air:
Exhaust hot air from window
Open window slightly and use the fishtail.
Close the window as much as possible leaving the fishtail outside.
Exhaust hot air from door
Open door to an appropriate angle to exhaust condensate hose outside.
Remove the exhaust air duct from the unit when not in use and store away
carefully.
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