7:5a All the doorways had rectangular frames,

The door openings all had four-sided frames.
-or-
Each of the doorways and doorposts had four sides.

7:5b with the openings facing one another in three tiers.

The Hebrew text of this verse is difficult to understand.

They were built in the front area ⌊of the house⌋. They were in three separate rows and were placed opposite each other.
-or-
They were in the front part ⌊of the hall⌋, on three different levels. These doors faced each other.

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