Home Matrix 5000 Noisy Fan

[BillP]

I have a Matrix 5000 at home.  I have a separate load panel that has hallway lights, computers, fridges, the hot water tank and the furnace (fan) on it.  I have to XL packs and it runs about 20% to 30% on average ... giving 4 to 8 (-ish) hours run time.  I've had this configuration for about 15 years now (actually found the unit at a surplus store for $100 ... I'm pretty sure they didn't know what it was).

Anyways... recently, after replacing all the batteries, at least one of the main unit fans are noisy.  I would like to replace them, but I'd like to avoid having to tear down the unit first to get the fan data.  Can someone tell me what size and voltage of fan to source?

In case it matters, this is what the management card says about it:

About UPS
Model:	Matrix 5000
Serial Number:	80047844
Firmware Revision:	5ZI
Manufacture Date:	03/15/00