What did the Apollo 1 disaster lead to regarding the Command Module's safety design?

Answer

The incorporation of less flammable materials and a new, outward-opening hatch mechanism.

The disaster required a complete redesign of the Command Module to include less flammable materials, a new outward-opening hatch, and changes to the atmosphere mixture used during ground tests.

What did the Apollo 1 disaster lead to regarding the Command Module's safety design?
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