From the first-hand account of a Paramedic, the sole medical provider to workers on an oil and gas installation in the Gulf of Mexico:
The most common medical conditions having to treat offshore is related to acute infectious illnesses such as flu-like symptoms and the common cold. As a single facility, we invest thousands of dollars annually on various medical supplies and OTC and prescription medications to see that our crew members remain healthy and illness-free.
In the event of illness exposure in the industrial environment, it could lead to lost wages, time away from work, delays in planned activities, unnecessary downtime, and the carried risk associated with the safety of the crew and evacuation of crew members from the facilities via helicopter. Since we introduced portable Sentry DHP devices in every bedroom and commonly occupied rooms in our living quarters, I've seen a significant drop in communicable illness complaints, including general allergies.
Testimonies from the crew have been overwhelmingly positive with some testifying for the first time in their careers (that) they wake up daily having the freedom to breathe without a stuffy nose or scratchy throat. Some even shared they have ceased their daily regimen of antihistamines and other preventative treatments. From what I witnessed, the units have worked as advertised and provided us with a solution to an unending issue. I can say with confidence, based on the witnessed results, these units are a necessity to maintain the well-being of those in any workforce.