Combustion Air Requirements
There are four possible combustion air sources in your home;
House living space
In some cases combinations of the above combustion air sources is required, but the application of each has to be determined on an individual basis.
EXAMPLE of the combustion air calculations
For your own safety; I want you to examine the location of the fossil fuel burning appliances in your home as soon as you finish reading this chapter (furnace, water heater, fireplace, heating stove, etc.). If you have a problem figuring combustion air requirements and determining if everything is correct, email me with detailed description of your [...]
Combustion air is required for all types of fuel burning appliances in our homes to properly burn that fuel.
Combustion air has three functions:
It is required to properly burn fuel
To dilute exhaust gases that are being vented to exterior
To vent and cool appliances
The most popular fuel used in our homes is of course natural gas.
For every one cubic foot of gas, there are 10 cubic feet of combustion air needed for clean burning in addition to dilution and ventilation air.
There are two products out of a perfectly balanced gas combustion – carbon dioxide and water vapor, which are perfectly safe. [...]