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Memory Alpha

A blowscreen was a component of Federation refitted Constitution-class starships in the 23rd century found within Jefferies tubes.

Aboard the USS Enterprise-A in 2287, Montgomery Scott directed James T. Kirk, Spock, and Leonard McCoy to take a right at the hydro vent and then left at the blowscreen to reach a turboshaft that led to the forward observation room. (Star Trek V: The Final Frontier)

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