Reference

The specific reason for windows being covered on the west side of an annex can vary depending on the context and location of the building. Here are a few general reasons why windows might be covered:

1. Privacy: Covering windows can provide increased privacy for those within the annex.

2. Security: In some cases, especially in areas where security is a priority, covering windows can prevent outsiders from looking in and potentially identifying sensitive information or the layout of the interior.

3. Protection from Sunlight: West-facing windows can receive intense afternoon sunlight, which can cause glare and heat buildup. Covering these windows can help to manage indoor temperatures and reduce the need for air conditioning.

4. Aesthetic or Renovation Reasons: Windows might be temporarily covered during building renovations or for aesthetic changes being implemented in the building design.

If you have a specific building or context in mind, please provide additional details for a more precise answer.