Ayce YWD-10, Operator'S Manual, Page: 120 / 148

Trim off the excess vent tube using a sharp
knife, keeping the edge as neat as possible.
Insert the indoor fixing ring from the
vent cover onto the indoor side of the
air vent. Then fold the external vent
cover in half. Attach the chains to each
side of the vent cover, before sliding
the cover outside through the vent
hole.
Expand the external cover, before tightly fixing
the chains by hooking onto the indoor fixing ring.
This will hold the external cover firmly in position.
Repeat for the second vent.
Once the chains are fitted and secure, any excess
chain should be removed by cutting the chain.