N-Filter

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The N-Filter is the circular tube at the bottom of the Pack, connected to the Cyclotron. It has a solid red line and nine seemingly-white holes in the diameter. It also has a rub-down transfer on its front. Its usage is unknown though speculation suggests the N stands for Nitrogen, which could be used to cool the Cyclotron.

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Like the Ion Arm or the Raytheon Crank Knob, the N-Filter changes appearance between the Ghostbusters films. In the first film, the N-Filter holes seem to have a mesh covering the inside:

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However, in Ghostbusters 2, this mesh seems to have been removed, thus, the holes are a solid white:

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One theory is that the mesh holes where filled in in order to create the molds for the second film http://www.gbfans.com/community/viewtopic.php?t=28595