how do you stop an air filter from freezing?

Originally Posted by alloy2

I think you have the air filter confused with water separator.



The purpose of the water separator is to remove moisture from incoming air which is condensed into H2O ( water ) modern water separators have a float inside the bowel that lifts when the water reaches a certain level discharging the water from the filter canister.

On the bottom outside of the bowel a needle valve protrudes, I suggest you manually drain the filter when leaving the shop, don't worry about the collected water freezing while the plasma cutter is in use the incoming air will be warm enough to prevent freezing.

You definitely do not want to put the condensed water back into a vapour form.

Right, I understand. I'ill be using both a filter and water separator at the cutter in addition to the one's at the compressor, which is about 40' away and the supply system between isn't ideal.