You mean the exhaust is rectangular. The intake is always round on these blowers.
What I've done is to take a round duct "plug" and cut a square/rectangular opening in them, mount it to the exhaust port flange on the blower, then start the duct from the plug.
Alternately, if you are going to go directly to a window, then I'd cut a piece of plywood to fit your window opening, then cut a square/rectangular opening to match the exhaust port flange, and mount the whole assembly in the window.
To mount duct to the intake, there is a flange that is held in place with 3 screws. Remove the screws and the flange, then use the flange as a pattern on the duct end plug, and cut a hole to match. When you are ready to re-assemble, put the flange inside the duct plug then mount both to the blower, so that the duct plug is held in place by the flange. Then mount your ducting as usual.
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Chaotic Glass: Safety for the glassworker, and random thoughts and opinions on the state of the glassworking world
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