What is a direct fired makeup air unit?

What is a direct fired makeup air unit?

A direct fired make-up air unit is used when fresh air has to be introduced from outdoors for ventilation purposes. Its primary purpose is to ventilate the space adequately in order to preserve and maintain acceptable ambient air quality. These appliances supply heated or cooled air, depending on the building’s needs.

What is a gas fired makeup air unit?

Gas-fired make-up air units provide fresh outdoor air to your building to replace air that has been exhausted out through your air system. Depending on the needs of your facility, you may wish to install a direct gas-fired unit or an indirect one.

What is an air make up unit?

Make-Up Air units are designed to replace exhaust air by bringing in fresh outdoor air into the space and heating or cooling it to the desired condition and discharge the conditioned or tempered air into the building.

What is the difference between direct fired and indirect fired gas heaters?

Direct-fired heaters use 100 percent of the combustion gases to heat air, making them more efficient than indirect-fired heaters. Some heaters can operate in areas with temperatures as low as -30°F. You may use ducts to carry hot air throughout a site or facility without worrying about fumes or exhaust.

How do you calculate air makeup requirements?

Calculate the required volume. Divide room volume (Step 1) by total/1000 (Step 2). If less than 50, additional air is needed. If greater than or equal to 50, no additional air is needed.

Is makeup air required?

In the US, the construction industry has long recognized the need for adequate makeup air for exhaust systems. Beginning in 2009 and in every version since, the International Residential Code (IRC) has required that makeup air be provided for kitchen hood exhaust systems with capacity of 400 cfm or greater.

What is MAU unit?

mAU is the milli-absorbance unit, or 0.001 absorbance units (AU), used to measure absorbance.

Does every room need a vent?

Today, it is recommended to have one or multiple air vents in each room of your home or business to optimize air flow and reduce the cost of energy spent on cooling your home or office.

How does a MUA unit work?

Simply stated, a make up air unit pulls air in to your space from outdoors and conditions it to the indoor temperature, to replace air that’s pulled out by your kitchen exhaust equipment. Without it, you get back drafting, poor temperature control, negative air pressure and air quality problems.

What does indirect fired mean?

In an indirect fired heater the burner is fired into a heat exchanger. Air is heated by passing over the heat exchanger, allowing the combustion by-products to remain within the heat exchanger which is then exhausted through a flue. An everyday example of an indirect fired heater would be a gas furnace with a chimney.

Which is the indirect fuel fired furnace?

Indirect fired heaters are just like your home oil or gas burning furnace with a chimney. With propane or natural gas heating units, the flame is contained in a burn chamber which heats a “heat exchanger”. The cooler air passes over and around the heat exchanger, thus heating the air.

Do I really need makeup air?

Even with a powerful hood, you may not require makeup air if it is installed in a large kitchen or well-ventilated space. However, if you live in a small space or the ventilation is not adequate, make up air is likely a good option for you.

How does a direct fired make up air unit work?

In a direct fired make-up air unit, the air that is to be heated is passed directly over an open flame. No heat exchanger is involved. This design results in an extremely efficient system that achieves 100% combustion efficiency and a 92% overall thermal efficiency (with 8% of the total heat lost in the latent heat of water formed in combustion).

What are the different types of direct fired air?

The units are available in four different air styles- MUA (100% outside air with a fixed discharge air volume), FR (fixed 80% return air / 20% outside air with a fixed discharge air volume), AM (modulating return air / outside air with a fixed discharge air volume) and VAV (100% outside air with a variable discharge air volume).

What makes a direct gas make up air unit so efficient?

Direct gas-fired make-up air units feature burners that are 92% efficient and capable of up to 30:1 turndown. The burner construction consists of a cast aluminum manifold with stainless steel mixing and end plates, drastically reducing burner maintenance in the field.

Is the Trane direct fired air unit factor Y tested?

Trane direct-fired units are factor y tested, include the necessary controls for operating the system and generally cost less than alternate systems. MUA-PRC007-EN 3 Introduction Installation is simple since the unit, (when shippi ng permits), is shipped as a complete package.