Rodents

The key is to stop them from entering. First you need to seal all entry points in the floor. This means foaming all pipe holes...wire hole including behind the converter...waste lines and gas lines. Then if you have a heated basement you need to prevent them from entering there. The duct is open in the basement but the basement is not and really can not be sealed. The rodents enter the basement duct then migrate into the furnace and out the ducts into the camper. I removed the 4" and 2" ducts going to my basement and fabricated screens using thin aluminum flashing with lots of 1/8" holes drilled in it and installed in the furnace adaptors. Keep in mind a mouse can enter through a hole the size of a pencil so it needs to be sealed well and have small holes. Upon opening up the furnace I found acorns in the heat exchanger if the furnace. Once sealed I no longer get mice. Another way to seal it is to seal off the heat outlets....but that still allows the mice to deposit urine and feces in the ducts and furnace.