Cooling fans in the P-3 and P-5?

Hello everyone, would you tell me if the P-3 and P-5 regenerators have cooling fans installed?

Thank you, Mark

I know for certain the P3 does, 99% sure so does the P5. Used the P3 for all my head end equipment. The fan came on once in a great while but when it did, it was whisper quiet. No big deal.

I had P-3s and now have P-5s. They both have fans. They come briefly when the units are first turned on.