When replacing or updating your furnace or air handler you will need to know your system configuration. Understanding the difference between upflow, downflow, and horizontal configurations is crucial to ensure that you are purchasing the correct system.
Vent free appliances can also be referred to as "ventless", "non-vented", and "unvented” appliances. Let's briefly look at what a vent free appliance is so that we can gain a better understanding of their safety.
