Because It Wouldn't Fit In The Chimney
It was left on my front porch. Actually, my chimney's so small that hardly anything fits in it, including liners required by code.
The plan is to install it over the weekend where I can get a buddy or two to help. It supposed to be dry (yes, Portland gets dry days from time to time), but it might be windy which in my opinion is the worst weather to work in. Out in the entrance of the gorge, about 10 miles from my house, they were calling for 50 mph winds.