high door, high gate, high, loft
閬 centers on a tall, imposing entrance: a high door or gate, and by extension something lofty or a loft space.
閬 combines 門 (gate) with 良, which likely contributes the sound and may hint at something good or substantial, suggesting a grand or high gate.
The gate 門 encloses 良, which looks like a good, solid structure. Picture a towering gate with a sturdy inner frame, leading to a high loft.
For ロウ, imagine a row of high gates lining a grand avenue: row -> ロウ, and each gate is tall and imposing.