Cliff,
just another thought on your fumes.
I have been told by customers that if you activate the preheat for a minute before starting, the fumes are decreased substantially. You have to have the key in the start (crank) postion for the preheater to work on the 4110. I tell my customers to engage the pto or put the shift lever in gear, then turn the key to the start position for 30 seconds or so. They tell me that when they do that, it starts much easier, and doesn't smoke up the garage nearly as much.
But, it looks like you have a vent now anyways.