Albert Barnes Commentary Ezekiel 41:5

"Then he measured the wall of the house, six cubits; and the breadth of every side-chamber, four cubits, round about the house on every side." — Ezekiel 41:5 (ASV)

The wall of the house - This was the outer wall of the temple itself. Its thickness of six cubits corresponds with the colossal proportions of the architecture of the east.

Every side chamber - the side-chambers (D). These were a marked feature in Solomon’s Temple, and were probably used as storehouses for the furniture and property of the temple. The arrangement of these side-chambers differed in some respects from that of Solomon’s Temple, the object of Ezekiel’s vision being throughout to bring all things to a more exact proportion.