[Ian]

Just as a 'think on'......

You need a cheap controlable source of air under enough pressure to run a forge yes?

That means idealy something (fanwise) thats built to shift a lot of air through narrow ducting. If it has at least four speed settings all wired up even better yes?

Chances are your about six feet away from one just like that everyday.

Even better chance you can get hold of that one pretty cheap from an autowreckers.

Running it from a 12V battery makes it portable and mains power independant and quite possibly capable of hours of service. (you can take two batteries if you can take one)

For the workshop you could possibly run it from a cheap battery charger, cheap and cheerful.

Make sense to anyone?