"Phil Anderson" wrote in message
news:9ztZa.78172$cF.24225@rwcrnsc53...
The current fan is a Toran A450, rated at 115V and 0.25amps, if I
am reading it right. The size, in mm, is 119x119x38.

Here's a couple computer fans that are the correct dimensions:
http://www.newegg.com/app/viewProduc...180-009&depa=1
http://www.newegg.com/app/viewProduc...999-007&depa=1

Like most all computer fans these are rated to run on 12VDC, and will run
slower with reduced voltage. But going too low might make startup
unreliable, as you've already found. Both of these are quite robust with
airflow ratings over 100CFM, so you'll probably want to slow them down. The
Panasonic fans have a pretty good reputation.

Other possible sources (perhaps you could even find a 120VAC fan) are
www.digikey.com and www.mouser.com . Good luck.