Inhaled Treprostinil in Participants With Pulmonary Hypertension Due to Chronic Obstructive Pulmonary Disease (PH-COPD)

Inclusion Criteria: 1. Participant voluntarily gives informed consent to participate in the study. 2. Participant completed Study RIN-PH-304. 3. Women of childbearing potential (defined as less than 1 year post-menopausal and not surgically sterile) must agree to practice abstinence or use 2 highly effective methods of contraception (defined as a method of birth control that results in a low failure rate, \[less than 1% per year\], such as approved hormonal contraceptives, barrier methods \[such as condom or diaphragm\] used with a spermicide, or an intrauterine device) for the duration of study treatment and for 48 hours after discontinuing study drug. 4. Males with a partner of childbearing potential must agree to use a barrier method (condom) with a spermicide for the duration of treatment and for at least 48 hours after discontinuing study drug. Exclusion Criteria: 1. The participant is pregnant or lactating. 2. The participant was prematurely discontinued from Study RIN-PH-304. 3. The participant is intolerant to inhaled prostanoid therapy. 4. The participant is unwilling or unable to use Sponsor-provided devices (actigraph, spirometer, or smart device). 5. The participant is scheduled to receive another investigational drug, device, or therapy during the course of this study. 6. Any other clinically significant illness or abnormal laboratory value(s) that, in the opinion of the Investigator, might adversely affect the interpretation of the study data.