How do I determine if a Combustion Air In-Forcer is necessary?
Most installations rely on air for combustion to be available through infiltration. Combustion air is often overlooked for the correct volume of air required to support the burner. Most contractors will provide a combustion air intake. This is typically a flexible duct that will allow outdoor air to be drawn in as the burner fires. The down side of using a passive method is the air entering can be affected by cross winds, making it difficult to get the correct volume of air needed. The heating capacity of the appliance will determine the amount of air needed. Residential homes require anywhere from forty to eighty CFM. That doesnt seem like a lot of air unless you consider the size of your mechanical space. If your room is eight foot by eight foot that gives you sixty-four square feet. If you multiply sixty-four by the height of the ceiling (which is typically eight feet) that will give you five-hundred and twelve cubic feet. If youre consuming eighty CFM you will use all the air in th
