The new feature in the bullpens at Citizens Bank Park aims to improve fan experience. Starting this season, the bullpens now have an enclosed space with accordion-style doors that provide protection from the elements. This addition comes as part of various changes made to the ballpark for 2025, designed to enhance the overall game-day atmosphere and fan interactions.
Source: https://www.inquirer.com/phillies/citizens-bank-park-bullpen-changes-fans-taunting-doors-phillies-20250331.html