I bought an APC uninterruptible power supply (UPS)to protect the projector bulb. A sudden shut-off can shorten the life or even ruin a $300 bulb - so the $50 for additional 10 to 15 minutes of continued operation is worth it. This will give us time to properly shut the projector down if the power goes down.
I selected APC, since it is the "standard" for UPS units. The best price I could find was through Amazon, including free shipping.
Rather than try to hide the UPS, I am mounting it on the beam near the projector. I will keep it back at least a couple of feet to allow maximum air flow around the projector, and not transfer any heat.
I am still looking into adding an additional fan up by the projector to cool the area further, but I don't want to stir up extra dust either.