My solution for the outdoor blower problem:
I bought a plastic patio bench/storage box from HD about 3 years ago, cheapest one I could find, about $50-
Now don't laugh, this is a work in progress, but it works great! - My problem is finding time to finish the job
- I just did this last summer...
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The duct comes down from the garage window, into the back side of the box thru a 4" hole, connects to the blower, exits out the left side then enters my experimental 'smell' box, which is semi-filled with cheap charcoal briquettes, then exits the other side of the box. The charcoal helps a lot, but I need more of it. The box, which I though would resonate and make the blower more noisy, does just the opposite, it cut the noise by half. The exit air makes no noise. I have the blower sitting on some pink insulation which I assume helps. At 1am, standing 25' away you can barely hear it. From 50' away it's near dead silent. Neighbors say they can't hear it
I ran it all summer, no heat issues, the motor gets the air it needs from the hole in the side of the box, and the box is anything but airtight so warm air just gets pushed out.
The other blower sitting there is also going inside the box, as there's plenty of room for both of them. That's why all the excess ductwork, it'll get trimmed up when I get the other blower put in the box...