I have the following questions on air filter:
1. What kind of air filters do we use?
2. How often do we have to change them?
3. I am looking for air filter of size 17x14x1 or 18x15x1, can't find it anywhere, what is my best bet?
Thanks!!
1. What kind of air filters do we use?
2. How often do we have to change them?
3. I am looking for air filter of size 17x14x1 or 18x15x1, can't find it anywhere, what is my best bet?
Thanks!!