I can get a flatter finish with a quality roller and if necessary, additives, than I can with a brush.
You must spend more time just going up and down stepladders than I spend rolling the whole ceiling.
Anywho, getting back the OP's question. Most of my work is domestic so i don't own an airless sprayer but if I had to paint a factory ceiling I would consider one with extendible lances.
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