When i move into our new facility, i'm trying to figure out how to use the exhaust from the reflow ( about 4kW ) to heat the workshop. In our environment temp often gets to around to 3-6 degrees C, so we need to warm it up a bit in the winter.. Even if you like working in the cold, The Peel tape on most componetns does'tn. You need to be running at least 18C for it to peel nicely. Less than that and it often doe'stn come away cleanly. Tape not peeling off reels is in my top 5 things that cause me problem.
Just get a countercurrent air to air heat exchanger, and run the exhaust through that. Common in HVAC as a way to save energy while still having forced air exchange in a well insulated and sealed building, and has all connections available in standard duct size, so connecting is easy. This will at least get the incoming air to around 20C easily with the hot exhaust providing the heat, and so long as you keep the inlet and the exhaust ports separate, and place a HEPA filter on the inlet, exhaust duct higher up with a stack of sorts and a rain hood, it will work. This might require an inline blower on the exhaust air side, as the printer exhaust fan probably will be inadequate to handle the extra load, and a small inline Luft fan will move a lot of air. Add a thermal fire detector in the duct as well, to turn off the blower in case fire breaks out, and also add metal vent shut offs as well for this fire damping.
For the OP, I would suggest the window mount kit for a portable airconditioner will be the best removeable way to exhaust air, as this is meant to fit all sash windows with no problems, and involves no permanent alterations to the structure at all. Plus it is small, and has a duct adaptor already on it, and a mesh insect filter to keep the bugs out.