Top 33 How Big Should A Supply Plenum Be Top 13 Best Answers

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Single plenums should not exceed 24 ft in length. Double plenums should not exceed 48 ft in total length.How tall should my plenum be? For a gas furnace, the top of the plenum needs to be a minimum of 1″ from the bottom of the floor trusses. If the manufacturer has a requirement, it will be in the IOM that came with the furnace. 20″ tall will be fine.For 5-ton HVAC systems, an additional 6″ plenum on the bottom or the side of the furnace is super important.

How tall should my plenum be?

How tall should my plenum be? For a gas furnace, the top of the plenum needs to be a minimum of 1″ from the bottom of the floor trusses. If the manufacturer has a requirement, it will be in the IOM that came with the furnace. 20″ tall will be fine.

What size plenum do I need for a 5 ton unit?

For 5-ton HVAC systems, an additional 6″ plenum on the bottom or the side of the furnace is super important.

Can a supply plenum be too big?

Single plenums should not exceed 24 ft in length. Double plenums should not exceed 48 ft in total length.

Do I need a supply plenum?

A: In modern forced-air HVAC systems, you must have a plenum installed.

What does a supply plenum do?

What is a supply plenum box? The supply plenum box connects to the supply outlet of your furnace, heat pump, or AC unit. It receives the newly heated or cooled air directly from the unit, then distributes it to your ducts to be circulated through your home.

How hot does a furnace plenum get?

The temperature rise from return to supply is usually between 40 and 70 degrees. A reasonable operating temperature would be 140F.

Is it OK to reduce duct size?

By restricting the duct size it will cause more resistance and have less air flow because the air will take the path of least resistance. All the other ducts would have a higher flow with the 6″ compared to a 8″ duct because they are all in parallel. Such a reduction will increase noise.

How far apart should duct take offs be?

This is the ‘Two-Foot Rule?. Ideally, you should allow at least 24′ between takeoffs and at the end of any duct run.

What is a supply and return plenum?

A supply plenum works by taking in the new cool or warm air from the heater or air conditioning system and, in turn, distribute it throughout the building using the HVAC’s ductwork. A return plenum takes in that used air and, using the ductwork, sends it back to the core HVAC system.

What is a plenum and where would I find one HVAC?

A plenum is an air-distribution box attached directly to the supply outlet of the HVAC equipment that heats or cools the air to make the house comfortable. The ductwork that distributes the heated or cooled air to individual rooms of the house connects to the plenum.

What is volume damper?

A damper in an HVAC system, also known as Duct Damper or Volume Balancing Damper is a movable plate, situated in the ductwork that regulates the flow of air and redirects it to specific places of a house.

What is a return air plenum?

What is a return plenum box? The return plenum box receives used air from the return vents and distributes it to your HVAC unit to be heated or cooled again. The used air must pass through a filter before entering the return plenum, ensuring that it’s clean before it reenters your AC, heat pump, or furnace.


How to Size Ductwork? #Ductwork #ductsizing #hvac
How to Size Ductwork? #Ductwork #ductsizing #hvac


how big should a supply plenum be

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hvac plenum box design sizing calculation, air distribution plenum box sizing of FCU and AHU) – YouTube

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hvac plenum box design sizing calculation, air distribution plenum box sizing of FCU and AHU) - YouTube
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FAQ: What is plenum height? – De Kooktips – Homepage – Beginpagina

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FAQ What is plenum height

What does plenum height mean

What is considered a plenum ceiling

How tall should my plenum be

What is considered a plenum area

What is the purpose of a plenum

What is a plenum in an HVAC system

What is plenum clearance

Is an open ceiling considered a plenum

What is the area above the ceiling called

What are non-plenum ceilings

What does Chicago plenum mean

Do houses have plenum space

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FAQ: What is plenum height? - De Kooktips - Homepage - Beginpagina
FAQ: What is plenum height? – De Kooktips – Homepage – Beginpagina

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What’s That 6″ Plenum For? | PV Heating & Air

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  • Most searched keywords: Whether you are looking for What’s That 6″ Plenum For? | PV Heating & Air Updating Have you ever seen a gas furnace with a return plenum on the side and the bottom and wonder what it’s for? Find out the purpose for the 6# plenum here.
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For 5-ton HVAC systems an additional 6 plenum on the bottom or the side of the furnace is super important

Why is this such a common problem Why can’t contractors just install systems per the manufacturer’s specifications

In reality failing to add the 6 plenum to the indoor unit is the more expensive choice You don’t save money in the long run

At PV we always install the 6 plenum on 5-ton systems We often install it on 4-ton and 3-ton systems too

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What’s That 6″ Plenum For? | PV Heating & Air

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hvac design Part 4 ll Plenum box sizing & Heat transfer coefficient U value calculation procedure – YouTube

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hvac design Part 4 ll Plenum box sizing & Heat transfer coefficient U value calculation procedure - YouTube
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plenum sizing – DoItYourself.com Community Forums

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 plenum sizing - DoItYourself.com Community Forums
plenum sizing – DoItYourself.com Community Forums

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How Large Are Plenums Required For HVAC Systems?

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LOCATING THE PLENUM BOXES

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How Large Are Plenums Required For HVAC Systems?
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FAQ: What is plenum height?

If the space above the drop ceiling is used for environmental air transfer, meaning the air above the drop is apart of the air return, then it is a plenum area and plenum rated cables shall be installed.

What does plenum height mean?

In building construction, a plenum (pronounced PLEH-nuhm, from Latin meaning full) is a separate space provided for air circulation for heating, ventilation, and air-conditioning (sometimes referred to as HVAC) and typically provided in the space between the structural ceiling and a drop-down ceiling.

What is considered a plenum ceiling?

A plenum ceiling is one that uses the space between the top of the suspended ceiling and the bottom of the floor above to handle air for ventilation. All suspended ceilings are not plenums; some may use HVAC ductwork to move air to returns and diffusers located in the ceiling tiles (a ‘dead’ ceiling).

How tall should my plenum be?

For a gas furnace, the top of the plenum needs to be a minimum of 1″ from the bottom of the floor trusses. If the manufacturer has a requirement, it will be in the IOM that came with the furnace. 20″ tall will be fine.

What is considered a plenum area?

In building construction Plenum is a separate space provided for air circulation for heating, ventilation, and air-conditioning. It is commonly found in the space between the structural ceiling and a drop-down ceiling or under a raised floor.

What is the purpose of a plenum?

Plenum boxes are usually situated on either side of the fan or heat exchanger and have the important function of bringing in, distributing, and removing air. They are the air’s first stop after being heated or cooled and its last stop before going back into your AC, heat pump, or furnace.

What is a plenum in an HVAC system?

A plenum is an air-distribution box attached directly to the supply outlet of the HVAC equipment that heats or cools the air to make the house comfortable. The ductwork that distributes the heated or cooled air to individual rooms of the house connects to the plenum.

What is plenum clearance?

Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.

Is an open ceiling considered a plenum?

Plenum spaces are the open spaces above the ceiling or below the floor that are used for air circulation. Technically, any ductwork is considered a plenum space too.

What is the area above the ceiling called?

If there is a horizontal ceiling that is attached to the tie-beams of a roof, creating a space above it, the space above is called an “ attic ” whether used as a living, storage, or simply ventilation space.

What are non-plenum ceilings?

Typically, spaces between the structural floor or a dropped ceiling are considered plenum. Some drop ceilings are actually designed tight enough to where air circulation is restricted and may be considered a non-plenum area.

What does Chicago plenum mean?

This means that any recessed lights installed in those areas also need to be air-tight. This requirement is known as “Chicago Plenum” which requires the housing to be airtight in addition to requiring all wiring to be sealed off and gasketed from the plenum air space.

Do houses have plenum space?

The Connection between Plenum & Cabling: These spaces are for air-conditioning and heating in any infrastructure. Generally, spaces between the structural floor or a dropped ceiling are plenum spaces.

What’s That 6″ Plenum For?

Ever seen a gas furnace with a return plenum on the side and the bottom?

Many people haven’t because most HVAC installers don’t bother with the bottom plenum. But if you have seen one, it’s usually a sign of a smart, conscientious installation.

Allow us to explain…

For 5-ton HVAC systems, an additional 6″ plenum on the bottom or the side of the furnace is super important.

The reason? Airflow. With the additional 6″ plenum, you get more of it.

It’s true in all 5-ton systems, but several 4-ton systems also require the 6″ plenum. And if there’s enough space to install one or we need to reduce static pressure in the system, we’ll even install the 6″ plenum in a 3-ton system.

Airflow matters for several reasons. For starters, it affects the comfort of a home’s occupants. With too little airflow, your system might not effectively distribute air throughout the home. That’s bad. Inadequate airflow also has a negative impact on system performance. Think poor efficiency, high operating costs, and premature equipment failure.

But when return air enters the furnace from both the side and the bottom (or both sides), airflow increases. The system operates more efficiently, and you enjoy more consistent air distribution. It’s better.

More return air can also improve indoor air quality. Think of it like this: In a lot of 4-ton systems, 4″ of the 20×25″ air filter never gets used. You pull it out to change it, and there’s 4″ of clean filter at the top. Why? Because air was only moving through 16″ of the filter media.

You see, that filter was designed for a properly installed 4 or 5-ton system with an additional 6″ of plenum. Without the extra plenum, there’s no air for the rest of the air filter to, you know… filter.

Basically, your air isn’t as clean as it would be had your contractor added the extra plenum.

Why is this such a common problem? Why can’t contractors just install systems per the manufacturer’s specifications?

Money, time, and knowledge. When you don’t install the 6″ plenum, homeowners save money on labor and contractors save time on the installation. In some cases, the contractor might not even realize it’s a problem to neglect the 6″ plenum.

They don’t know what they don’t know. It’s a shame, but it’s common.

But you know who doesn’t beat around the bush when it comes to the 6″ plenum on a 5-ton system? HVAC manufacturers. Installation manuals say you need to install one. It’s abundantly clear.

In reality, failing to add the 6″ plenum to the indoor unit is the more expensive choice. You don’t save money in the long run.

Equipment failure, comfort problems, high utility bills, poor indoor air quality… All of these might be in your future if you’ve got a 5-ton system without 6″ of additional plenum.

Doing it the right way usually amounts to another hundred bucks or so on the installation charge. It’s worth it.

At PV, we always install the 6″ plenum on 5-ton systems. We often install it on 4-ton and 3-ton systems, too.

You probably already gathered that.

When you consider the problems you avoid and the comfort gains you enjoy by doing it right, it’s an easy choice. We also think it’s a choice most people would make if they knew what was at stake.

Unfortunately, most homeowners aren’t aware of the 6″ plenum “issue.” Many people don’t know how important it is to achieve optimal airflow throughout the home either.

But you do.

How do you size a supply plenum? – AnswersToAll

How do you size a supply plenum?

One is that the supply plenum should be no larger than the blower opening off the top of the air handler, which seems small, at only 16×11″. But most opinion, particularly from the HVAC supplier, is that the plenum should be the same size as the overall A.H. cabinet size, which is 17.5 x 21″.

How large should a plenum be?

2 x 40 or 80 inches would be the length of the plenum. There would be no branch connections at any point in the box that is less than 16 inches from the entrance side. Minimum recommended size is 2 x 16 or 32 inches; length is 1 x 36 or 36 inches.

What is the use of plenum in HVAC?

Plenum boxes are usually situated on either side of the fan or heat exchanger and have the important function of bringing in, distributing, and removing air. They are the air’s first stop after being heated or cooled and its last stop before going back into your AC, heat pump, or furnace.

How to calculate the width of a plenum box?

Width of plenum box = Area of plenum box / height of plenum box = A/H W = 4/1.6 Width of plenum box = 2.5 ft Depth of plenum can be calculated by using following equation:

What is the purpose of a return plenum box?

A return plenum takes in that used air and, using the ductwork, sends it back to the core HVAC system. Besides, what is the purpose of a plenum box? A plenum is an air-distribution box attached directly to the supply outlet of the HVAC equipment that heats or cools the air to make the house comfortable.

Why do you need a plenum box for AHU?

It is also used to balnce the air and attenuate the sound caused by air movement in the duct. We intriduced to you the calculation steps for sizing a plenum box for both AHU and FCU according to SMACNA. Supply air plenum sizing mainly depends on the air flow and the air velocity.

What is the plenum box used in HVAC system / ducts?

This is a box that connects to the heating, ventilation, air cooling system, to distribute airflows in it. This box is connected to the supply outlet of HVAC that cools or heat air in your house. First of all the air from the outside passes through filters in order to clean it from dust and contaminants.

So you have finished reading the how big should a supply plenum be topic article, if you find this article useful, please share it. Thank you very much. See more: ac plenum box design, how big should a return plenum be, plenum box installation, do i need a supply plenum, supply plenum box, plenum design, plenum design theory, supply air plenum box design

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