We want to install some portable aircon units in the office. They have 150mm flexible ducting for the exhaust. We have single glazed windows where we can make a hole to let the air out. However, there doesn't seem to be a simple plastic moulding that either: a) Is a simple grommet to line a hole with and we'd pop the ducting through. b) Is a proper louvred vent that has some kind of sandwiching mechanism and a spigot for attaching duct.
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