My home air conditioning outlet pipe was bitten off by rats, how to prevent ah?

1, if the use of PVC pipe can not be, you can use aluminum-plastic pipe when the outlet pipe; if the distance is short, it is best to use stainless steel corrugated pipe more insurance, not afraid of biting and not afraid of the wind and sun, but the price is a little higher.

2, it is estimated that rats in the inside nest, so we must first put out the rats to do, with a variety of rodenticidal tools to kill or drug poisoning, and then plug the hole with construction materials, wiring is also convenient to open. If the rat did not make a nest inside, the hole mouth directly sealed up during the day on the OK (the rat is absolutely in their own nest during the day to stay inside).