I would say it would be the exact size indicated on the box.
Assuming the measurements are correct then I would guesstimate that that would be the exact size required.
It is not waste. The furnace has extracted the majority of the heat through the combustion process to the point of "condensation". Condensation= H2O. lc
A balanced draft has both ID and FD fans. ID Fan works by pulling the gases through the furnace hence creating the required draft. Where as FD fan pushes the gases into the furnace. Hence in a balanced draft frunace, the ID fan can said to be removing the combustion gases.
Gas or liquid passed through bottom of the column and the solid particles from the top is fluidized below the maximum fluidization velocity with regeneration of continuos stage.
The waste products of combustion leave the internal combustion engine through the exhaust valve.
FD or Forced Draft Fans supply combustion air to the boiler. Different combustion controls demand a supply of combustion air in different ways but what they have in common they control the FD fan to provide enough air for complete combustion in the boiler furnace. In most systems in use today the ID or Induced Draft fan sucks the products of combustion from the boiler furnace, through the various passes of the boiler and pushes it out the chimney. How much or how fast this fan works is based on furnace pressure. The ID fan control set point is based on combustion side furnace pressure. If the furnace pressure goes up the ID fan removes more air to lower the pressure. As the furnace pressure goes down the ID fan removes less air. This air flow out of the boiler is referred to as draft. Both the FD and ID can be controlled by various means. The air flow can be restricted in the plenum or ducts by dampers or louvers or the speed of the fan can be changed by mechanical means from a fixed speed driver. Also the speed of the fan can be changed by the use of a variable steam turbine or an electric motor with VFD (Variable Frequency Drive)
through the top of the blast furnace
Through combustion they produce heat.
The boiler in which fluidisation and combustion is done in the bed with the help of (pa,sa&ta)air and ash(un burnt particle) is re-used through cyclone and siphone to the bed is called cfbc boiler.
Tramp air is any air that enters (infiltrates) the furnace through leaks. This air may be measured by the O2 analyzer and often contributes to the burning of the fuel. See the related link for further information.
No, an electric furnace does not need an outside air intake. For oil and gas furnaces an air supply is needed. It is called combustion air. It is needed for complete combustion of the fuel and not use the heated air that is in the house. Today's homes are built as a sealed unit to stop infiltration air from leaking in and costing the home owner more money to heat the home. Many installations use a motorized damper that cuts off the air supply when the furnace is not operating. This prevents a draft through the vent from the outside of the house when other extracting devices are operating.
The answer is through combustion.