air conditioner upgrade additional scond air pipe

thingiverse

25 cm square to 15 cm air pipe adapter Air conditioners with one pipe have a problem. If the seal of the room is too good, the airflow stops after some time. A second pipe can  help with that. It directs the air that usally comes from unsealed leaks in the room directly into the air conditioner. The cool air inside and the hot air outside do not mix. Only use with a net. Don't use too much sealing. A second pipe probably does not improve the efficiency.