Prem-I-Air EH1614/EU Manual page 5

Keep the hose as straight as possible, avoid dips where the moisture from the
exhaust air can condense and fill the tube with water. Do not allow the hose to be
crushed
The hose can be expanded up to 1.5m long, but the shorter it is the more
efficiently the E1614 will operate. Do not extend the hose, or replace with
another type of hose.
If the exhaust hose is to be installed into a wall vent then the vent position should
be between 40cm (16") and 130cm (51") from the floor.
Page 5