Put the other portal on the wall to your left facing Wheatley's TV. While Wheatley is informing you of your death option, place one portal underneath the Pneumatic Diversity Vent where the bombs come out.
The first is on the wall in which the funnel is being projected on, around the center (This will take experimentation.) The second is on the very right of the angled surface that you go through on your way to the exit. They both are smashed by lifting a box in a funnel and flinging it, but the exit portals are in two different locations.
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How to obtain: In these test chambers, Wheatley's TV monitors are able to be smashed in the following ways: (this must be done in one run.)