Lead ventilation

Lead ventilation

The ventilation of an unoccupied building space immediately prior to its occupancy. Lead ventilation is performed to dilute contaminants from building and HVAC sources to acceptable levels by the time occupants arrive.
References in periodicals archive ?
Objects salvaged from around the wreck and recently put on display at the museum include a wrist watch, spectacles, a White Star Line cup, a lead ventilation grille, a gold wristwatch, five tie pins and a five dollar bank note.