What Size Flex Duct For Mobile Home?

What Size Flex Duct For Mobile Home

If you are installing a heating or cooling system in your mobile home, then the first thing to consider is what size duct will work for the space.

A lot of people have been asking what size flex duct they should use for their mobile home.

Flex duct is a flexible plastic material that can be used to insulate your air conditioning and heating system to save money on your utility bills.

This blog post will cover the different sizes, how much they cost, and when you might need them.

Different Sizes of Flex Ducts For Mobile Home Air Conditioning & Heating System

There are major six sizes of flex duct that you can use in your mobile home:

  1. 4 inch – $12 
  2. 6 inch – $20 
  3. 8 inch – $23 
  4. 10 inch – $25 
  5. 14 inch – $33
  6. 16 inch – $38
sizes of flex ducts for mobile home chart

What size flex duct should I use?

If you have a small mobile home, then 4″ or 6″ would be the best choice for you. These two sizes work well with most 12,000-18,000 BTU units.

If you have a medium-sized mobile home or larger than 8″, 10″, 14″ & 16″ will do the job quite nicely since they will allow proper airflow to your AC/Heating system.

When do I need the different lengths of flex duct? 

4″ has the advantage of being able to go through a standard door frame, which makes it easy to install in most cases.

The 6″ is less expensive than 8″ & 10″ but it also needs to be attached to an exterior wall unless you are installing it in a closet or storage area.

8″, 10″, 14″ and 16 inches have the same length, which is 3ft in itself, making them more versatile in terms of installation in your mobile home.

The only difference between these two sizes is that the 14 & 16 inches are thicker with denser material which allow for better airflow when compared to 8″. This means that they will get the job done faster and more efficiently than their smaller counterparts.

How Much Cost of flex duct for mobile home?

The smallest size, the 4″, is very cheap when compared to its’ larger counterparts. It costs $12 per roll of 25ft which means that you will get 50 linear feet with every roll you buy.

The 6″ flux duck is more expensive than the 4″ but it still costs less than half of what 10″ & 14″ cost. This makes it a perfect choice for mobile homes that are medium in size or smaller – your utility bills won’t be too high!

8″, 10″ & 16″ all have the same price-point at $23 for a 50ft roll. These three sizes are great choices if you want to save money on your utility bills but still make sure that your mobile home has the perfect amount of airflow.

The 14″ flux duck is more expensive than 8″, 10″ & 16″. It costs $33 for the same length which means that it is almost twice as expensive when compared to its counterparts.

However, if you want maximum performance out of your AC unit, then the 14″ might be your best choice since it offers better durability and a higher airflow rate than any other size on this list.

How do I know what size flex duct I need?

All you need to do is measure the length and width of your AC/Heating vent (where it will be installed) and then compare that size to the chart above.

The chart above shows you which sizes of flex ducts fit into 2×4, 2×6 and 2×8 mobile home wall cavities.

To find out what types of insulation thickness your walls have, all you need to do is measure them – they are usually 2″ or 4″.

If those measurements fall within one of those three categories shown in the image on this page, then those three sizes would work well for your air conditioning and heating system.

If not, then choose a smaller size since it makes better sense than buying a flexible plastic material that will not fit into your mobile home.

How many CFM will a 6 inch flex duct carry?

A 6 inch duct will carry around 1,550 CFM of air and a 4″ will only carry about 925 CFM – this means that the material can handle almost twice as much air than your smaller counterpart.

How many CFM does a 14 flex duct carry?

A 14″ flex duct will have a higher airflow rate than the 8″, 10″ and 16″. It can handle up to 1,800 CFM of air – it is almost twice as efficient as any of the three other sizes on this list.


Flexible plastic AC/Heating systems work well for mobile homes because they allow you to regulate the level of airflow in your home by simply opening/closing windows & adjusting the vents inside your unit.

Flex ducts are cheap and easy to install, but it is important that you buy the right one for your needs since not all of them can effectively satisfy both heating and cooling requirements at once.

The chart above will show you which ones work best for which types of mobile homes. If you want to save money on your utility bills, make sure that you buy the right size – it will certainly pay off in the long run.

Thanks for reading and I hope this article was helpful!

Ruby Nicholls

I am a traveling journalist and content creator, in love with the world of Mobile Homes & RVs. I spend my time filling up on new adventures, and sharing them with you so you can feel inspired to travel too! Every experience is different and at the end, we are all tourists of our own lives.

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