It’s important for massive HVAC appliances to pull in oxygen from outdoors

If you’re a store as huge as Walmart, this effect happens at an exponential rate

Although a few building supplies are used with all applications, there are crucial differences to spaces designed for residing versus those meant for commerce. It’s relatively straightforward to imagine that a supplier intended to sell shelves worth of items to a small assortment of customers each day is going to have more electricity demands than a small dwelling that houses a single guy. Getting a section wired correctly so it is safe to use commercially can vary in price greatly depending on how sizable the supplier is going to be. The plumbing might need to be more costly if it’s going to be a restaurant with a dish room and multiple bathrooms. But these differences go quite a bit further than that. One small fact that few people realize is that most commercial heating and cooling appliances draw in trace amounts of outdoor air into the indoor climate control appliance. This might seem strange to some, however there’s a pretty reasonable explanation for why this is done. With the bigger a supplier gets with its foot traffic each day, more and more of the oxygen indoors is being used by the customers breathing it into their lungs. As they exhale, this oxygen is converted into carbon dioxide. If you’re a store as huge as Walmart, this effect happens at an exponential rate. If these crucial Heating, Ventilation, and A/C appliances didn’t pull in oxygen from outside, all of the customers would be breathing carbon dioxide after enough oxygen is reduced from the air. Although this is still technically the case with any indoor climate control system, it’s not a major complication so much with dwellings where the foot traffic is minimal and the air flow is good by comparison.
Live link