Whether the air conditioning manhole and air return outlet are together or separately?

The combination of the air return port and the manhole will make maintenance inconvenient or even impossible. For air conditioners with air return outlets, the size of air return outlets varies. If the size of air return outlets is large, it's OK. If the size of air return outlets is small, it can't be repaired normally when it needs to be repaired; In addition, the vast majority of air conditioners with air return outlets are connected with the indoor unit of the air conditioner by air ducts, which do not require maintenance. It is recommended to separate the air return opening from the access opening, and reserve appropriate size and place the access opening at the appropriate position.