When shopping for a Persian rug for a corridor, there are a few key factors to consider. First, measuring the space is essential to choose a carpet that fits well. Passages are typically narrow, so a runner rug is usually the best option. Next, measure the length of the corridor and choose a carpet that's slightly shorter than that to allow some space at either end. Next, consider the style of the rug. Persian rugs are known for their intricate designs and rich colors, so that they can add much visual interest to a corridor. However, you'll want to choose a rug that complements the overall decor of your home. If you have a more traditional style, a carpet with a classic pattern like a floral or medallion design might work well.