There are various reasons why a furnace orifice may be removed from an air conditioner. These include the fact that it may not be functioning properly, and the air conditioner may be underpowered, which can lead to discomfort in the person who is inside the unit. Orifices, which may have been removed are usually referred to as seals, or rather the rubber bands that attach them to the furnace.
One of the things you will notice as you are inspecting the air conditioner is that all of the seals are cracked. You may also notice that the insulation around the seal is damaged. The air conditioner usually comes with a manual or a user’s guide, which can help you understand what you need to do to repair the seal. It is also a good idea to take note of the date on the seal and check if there is a date on the air conditioner which would indicate the last time it was repaired.
What you should do is to start by removing the seal from the back of the air conditioner. It is usually a flat piece of rubber that will have a silver ring around it, but it could also be made from nylon. The air conditioner must be turned off first, so that the seals will come out easily. In most cases, the seal on the orifice is made from a metal ring and it is the front part of the seal. You can usually remove the seal using a pair of needle nose pliers. A flat screwdriver can also work here. You can then carefully remove the orifice from the air conditioner, while making sure that the air conditioner is not near any flammable objects.