Boilers, furnaces, and water heaters need adequate fresh air to function properly. Here's how to prevent problems.
Try breathing through a soda straw. It takes effort, and you'll probably get dizzy soon. A fuel-burning boiler, furnace, or water heater can also end up gasping for air when installed in a very tight house or a confined space. The appliance won't get dizzy, but it can't burn its fuel properly -- resulting in reduced efficiency, and possibly...
to read the full article.