nd.... the tank's viewing panel looks into a den that we use as a reading room....just a table and a couple of comfy chairs. There are two doors in my garage....the one on the right enters the house via a laundry room....the one on the left goes to the backyard. If you look closely, you'll notice that above this door is a pwoerful attic fan that evacuates the humidity from the garage to the outside.
Zane.... I'm not sure which pump that you're talking about....but, if I were to unplug both return pumps (the only pumps that take water from the sump to the tank), the total water that will back flow to the sump can be contained in the sump. If you look at the sump pic, you'll notice a horizontal black line on the right side of the sump that denotes the max fill line to avoid overflowing the sump.....but, even if I were to overfill the sump, there is an overflow drain that prevents any floods. When I do a water change, I turn off the two return pumps and allow the sump to fill....I then empty the sump and half my refugium (which equals 165 gals)...I then sponge clean the sump and refill. The main tank is undisturbed since the closed loop pumps still run. The water in the main tank only drops 1/2" when the return pumps are turned off.