Furnace Make Up Air Requirements

According to the u s.

Furnace make up air requirements.

Ten cubic feet of air contains 2 cubic feet of oxygen and 8 cubic feet of nitrogen and other gases combined with water vapor. If the furnace is in a small room then we need ventilation openings in the walls or door of that room to let in plenty of air to make up for the air that the furnace is using. The furnace is situated in the center of the basement with the gas hot water heater in. Several options are also available for the outdoor and indirect indoor make up air unit.

Cambridge air solutions is a leader in commercial and industrial make up air solutions. Our duct furnaces can be ordered with several different options so they fit your specific requirements. In addition our indoor outdoor direct fired make up air unit is an efficient way to supply tempered make up air to your space. Unfortunately the fresh air intake you have described is the second type and does not provide direct combustion air to the furnace room as it is directly connected to the return air plenum for the furnace.

A furnace must be supplied a specific amount of fresh air per cubic foot of gas burned. This fresh air will enter the air circulation system of the heating system which is separate from the combustion chamber on your furnace. We believe that it is about 12 years old non he and about 80 efficiency. Makeup air if you have a conventional furnace not high efficiency you can make a simple one by installing a dryer vent in the wall to outside about 2 1 2 ft above the floor pipe it to the area of the burners down into a 5 gallon bucket stopping about 5 inches above the bottom of the pail if your in a colder area insulate the pipe.

We hired an hvac guy to install a new aprilaire humdifier which is working well. Our furnace is a tempstar ntc6 gne upflow horizontal series located in a basement that is partially finished. The m series make up air units are on the cutting edge of make up air technology and boast many unique features other systems on the market cannot duplicate. Department of energy a defining feature of high efficiency furnaces is sealed combustion a process by which outdoor makeup air is piped directly into the burner.

To burn 1 cubic foot of gas approximately 1 000 btu for natural gas requires 10 cubic feet of air for perfect combustion figure 2.