A Slatted Window to Improve Airflow

This page is the CodyCross answer for the clue below from Fruits and Vegetables, Group 1916, Puzzle 2 (Vegetarian).

Question is: A Slatted Window to Improve Airflow

and the answer is: LOUVER

Word Meaning:

LOUVER — A type of turret on the roof of certain medieval buildings designed to allow ventilation or the admission of light.

Definitions from Wiktionary.