A new and distinct cultivar of Oxalis plant named \u2018Jroxfroja\u2019, characterized by its upright, outwardly spreading and uniformly mounded plant habit; numerous basal leaves; dense and bushy plant form; freely flowering habit; dark green-colored foliage; and white-colored flowers. The method includes receiving downlink packets destined for a downstream user device. A plurality of plate fins, are arranged in a stack and each has a plurality of open ended slots, one for each run of the tubes,.