How to Size Ductwork?  

Selling hvac info like a true drug dealer 😆🤑 give them a taste and then tell us if we want more it will cost you....I love this channel!!

someone related to flow.. was redoing the ductwork in an older home that had a newer furnace/ac. I asked the tech to clean the coil while we had the unit disconnected and when he pulled it out, to my surprise we found the installation manual laying there right on top of the coil, blocking flow. Guys, always check the new unit and remove foreign paperwork! That 8.5x11 manual had been there for a few years!

Thank you for all that do you for us Hvac guys. You are truly a blessing. Keep up the good work.

Thanks for the free video. Glad your members get to see the most important stuff. Just know that on my iPad, there is no way to join and be a member. All I see is the subscribe button. And I’m sure most people are in the same boat who click a video only to find out that the main info is behind a paywall that they can’t get to.

Thank you so much. You explained it very well, and easy to understand. Please make more videos

What size should my trunk line be? Also can one boiler control two air handlers?

How do I know the maximum airflow, CFM, that can be handled by some 6” flex duct I have in my attic, if I put in a booster fan to be able to increase aire flow at certain times? The duct says 4000 FPM maximum, it’s 6” duct and I’ve got about 15’ of duct run before the booster fan and then 15’ after the fan to the vent? The fan at top speed says it puts out 400 CFM. Thanks in advance for any help on this.

Can you make a video that compares a few common flex duct brands. Maybe include what can be found at big box stores vs HAVC supply houses.

And I’m not the only one feels this way what a tease

I'm just got my Hvac License in Ga. I familiar with duct sizing. But I want to get much better and use in every job. Whats your recommendation

Hey that's awesome! I was like #300 I should get a free hat or something 🤔 love the videos man! I know your doing the fellow hvac man a lot of good service by this video. I personally learn better through videos rather than reading books, thanks for being that somebody who is teaching this way

Question, i have less than 900 square ft home i was given a carrier 3.5 coil with heater blower. i was told that a 3.5 is too big for my home. and i should use a 2.5. i now have a 2.5 condenser by carrier. the house has 2 br,bath, kit, living room and a dinning room off the kit. in the hallway i only have room to access the attice there is no place for a large return. i am told i should put the returns in the ling room and bed room. i am doing the install by myself. what size vents and ducts should i use. i know the coil and condenser don't match. but which is better the coil being bigger or or smaller?

Awesome Ted good work buddy thank you.

How do know if the fan on the unit will have enough power to move the air? What is a duct system is too long for a fan to move the air effectively?

How do you become a member and what is the cost

I’m late but where do you get your ton from because in class right now when we’re finding our cfm we only use .1

Thank you bro may GOD bless you more

Question for a house 2,100 sqft what size of equipment?

little confused looking at buying a wood furnace the blower is 1800cfm but yet the out is 2 8 in pipes by the numbers that maybe good for 400 cfm total.... help this doesn't make any since to me.

Is there a formula for an air return duct size in relation to the supply size in a small sealed room? In other words I will be supplying a room with 2- 6" ducts. What should the return air size be?

Great content!

Hey there! Would mind sending me the rest of the video? Thank you

Looking at your chart is really helpful, but since I need help with commercial ductwork, the cfm I need isn't on your chart. what do I need for a 24,000 cfm unit?

Can I hire you to guide me thru changing the entire ac system in my home. I have ten years experience in home renovation. Ive never done hvac work other then adding power or gas to a unit. Thank you in advance.

I got 4 7” and a 8” and 1 5” vent attach to my plenum in a 750 square feet camp is that good r bad? It’s a wide open camp no ceiling

Just curious how much does 7inch an 8 inch cfm in the line??

I was at a house the other day where my suction pressure seemed a little low and I had 2 degrees of super heat. When I went inside to the furnace to take total external static pressure, it was rated for .5 but I was getting 0.8. I got .27 before my blower and .56 after my heat exchanger. I thought my evaporator coil maybe the problem because I was getting a pressure drop of .3 across it. I got .56 before the coil and .26 after the coil. I chemically cleaned the evaporator coil and even used a hose. That coil is spotless. Nothing changed as far as static pressure. I don't know the rating for that coil for pressure drop because there is no model number that I can find. The outdoor unit was a 5-ton so I'm assuming the evaporator coil was correct since it was the original evap coil since the house was built. So I started looking at duct sizing. I had a 20-in flex duct for my return. It literally 90 right off of the air handler and to the filters. I think I was getting plenty of airflow since my static pressure before the blower was .27 For my Supply I had three 14-in flex ducts and one 6 in flex duct going to some little room. I don't know if I didn't have enough Supply duct but it almost seems like the coil was like a brick wall. I should have pulled one of the 14 inch ducts off and check my static pressure but I don't think that would have changed anything since I was getting 0.26 after the evaporator coil. Anyway, i believe I have sufficient Supply. But I'd like feedback if possible

Hey, I’m a member. Do you have a video on return sizing for a 3 ton unit ?

I have 14 in flex duct running to heat pump but can't find 14 in can I reduce to 12 in flex duct ? If so what all needs to be changed?

Hello there , I would like to buy the full video , but I don’t want to do monthly payment . Is it possible to buy the full video ?

What about duct length?

My house is 800 sqft. We just had a two ton unit installed. We have 6-4” and for some reason our bedroom don’t cool as it should. The bathroom and basement is beautifully cool. We have to run window units when the temp gets hot. The thermometer in our house says it gets between 78-85 degrees which is insane considering we put the thermostat to 65 to cool the house. We need the bedroom cool because we don’t want our dogs to be heated. What should we do?

You never showed us the other side with the return vent size. Looking through your videos I can't figure out which one shows that info.

great video.

What size furnace i need for 1500sqft house?

All of the rooms of my home are even temp with the doors to the rooms open. When doors are closed, (why have a door if your not gonna close it), the smaller rooms with the door closed get warm. Seems like no one allows for this common thing!

Hello, How would you calculate a mobile home split system with an inside down flow air handler 3 ton . No return . The Mobile home is 16X80 single wide with 8 vents total. The original duct is the rectangular sheet metal, and it is degrading.The mobile home is 1999 model . The local supply shops do not have the sheet metal available & I am considering using Flex duct & I am not sure what size or may I even use flex duct in replacing the sheet metal . Thank you

How do you become a member

I have a unique situation. I’m a DIYer. I have a 440 sq ft hunting cabin. The size may go up to as much as 770 sq ft in the distant future. That being said, I have an electric furnace with a 1.5 ton condenser. The ductwork will be a straight run from one end to the other. It’s 38’ long. Am I fine installing 12”x 8” rectangular ductwork? Thx for any help. I’ll be purchasing ductwork this week

A 6" drop is only 80 cfm though per .05 design static

Is there a chance I can pay someone (you?) to design my duct system? I have a large two story building and just want to run a main line down the middle and branch out to the upper levels floor venting, having only a few outlets for the lower level. The building is 90 feet long and 40 feet wide, so do I need to reduce my main line to keep pressure up? Things like that seem like it would be easy for someone who dose this stuff, I just don't know where to find someone to ask.

Hello I liked and joined sir.

Thank you for your video, I dont understand what mean 8-6" for 2ton- 800cfm?

Are package units more efficient than split system?

Great video

Thanks for making these kind of videos. I have a 5 ton package unit that I have to install. Can I apply this knowledge to a 5 ton package system as it relates to the duct work I need for it?

Do you not measure the overall space for tonnage, then measure room size for pipe size, been doing this for 32yrs

How do you join??

How do I join

very cool man.

Do the same rules apply to ducted mini-split systems? I vaguely recall reading something about them using higher velocities???

Thanks!

6 " Flex or 6" metal per 800 cfm.....? Specific matter!

What if I have a living room that requires 400 CFM. Instead of using four or five 6 inch ducts, can't I use a couple of 8-in?

I appreciate this 🙏

my manager told me it was 85cfm for a 6 inch

TESP?

I gave it a dislike because we should NOT assume that a 6” duct will deliver 100 CFM. Measuring air flow is essential instead of using a rule of thumb.

Hey Tom how about 1.5 ton. I’m going to start a new project sq ft is 600. Please help me out I already hit your subscription channel tks

for got , this is a single story home

Total equivalent length

you must be talking metal ducting?

Come on my friend you just said we can watch the video on duck systems and you cut it short you gotta join come on

Use a ductalator.

With return air, and filters, the bigger the better. Prove me wrong please.

There's plenty of Information out there. You're saying a lot of good stuff but your duct calculations are not based on any scientific data. What's your TEL? What makes you say that a 6" pipe will give you 100CFM? There's no such thing as " giving" if everything is done right you will get a specific amount of CFM. But there's a lot more then just 6" pipe is 100 CFM. Maybe you save that for where you can make money

What is wrong with this presentation? Is the mission of size of your need of cooling and heating then size your project..

Wow the guy has good content but is trying to make a dollar as opposed to just helping out people. Thats sad idk why people can't just share knowledge for free and help each other grow.

Hi I have a 2 ton unit and need a new one but want to go with a 3 ton is that something easy to do I’m almost at 1800 ft.² coverage with four different returns