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Stupid question, cuz ive got to missing something hen calculating the Core Are Return Grill for a 18x10 grill = 18 in x 10 in = 180 inches^2 So when converting to feet (12" = 1ft) , why are you using 18" instead of 180? From my calculations it looks like its 180" / 12" = 15 feet. But in reality, 15 square feet doesnt sound right. EDIT: Nevermind, I knew it was something stupid I missed....you converted to feet first (18/12)*(10/12) = 1.25 ft^2

i think ur pakistani trying american accent

why did you change the design? you didn’t have 90 degree on the round layout.

Hello sir, how to calculate u Value for Aluminium profiles,

can you share your spreadsheet?

guys where did you get this 100 in (btu over 100) in what code

While listening, I kept puzzling over what this "parameter" measurement was. Then I looked at the screen and realized that the talking head was struggling to say "perimeter". Thumbs down.

Less view bro because you are not direct and clear Courage too

Hair Andler? Lol.good video but I can't not hear that lol

I think you misspoke. Blue horizontal axis is the static pressure and the yellow vertical is the fan CFM.

This is gold man. Thanks a lot. God Bless.

Whaaaaaaaaaaat are you saying man?

...what?

If youre in hvac, please disregard this video. He's WAY off

Sounds just like an engineer ; totally confusing.

Video starts 4:40

No gloves....

Hi, would you be able to share the table with me as well? Thanks.

Nice video, interesting part is your pictorial representation. create videos on different concepts of hvac

Thank you for explaining everything. Very useful.

Very nice

This was very hard to understand 😭

why does a round ductwork need to be taller?

Where did you get the 1.595?

Why 2.5 kJ/m3 energy for infiltration load calculation?

Area is 1350ft2, not 1.350ft2.

source plz

Can u plz share the source of these formulas?

No provision for latent heat?

Thanks for d video , summarized short and sweet 👍🏻

Man that was painful but I needed the refresher.

Can you please share the table and documentation you use? Thanks.

Are those values constant?

Great info! Always make sure to measure the duct hole opening, not the register faceplate dimensions to figure out what size vent you need. :) How to Measure Registers & Grilles ruclips.net/video/qvpknviK4dQ/видео.html

Can you help me I am wanting to find CFM’s for rooms once I know the Btu/h heating and cooling loads. I have the Manual J8AE spread sheet and the CFM outputs seem high to me and I wanted to see other calculations. I tried the Sensible Heat Formula of CFM = Sensible Btuh / 1.1 * Delta T But when I input those numbers I get higher CFM needed in areas that have lower Btuh heat loss/gain. Here is my example Home is in Laguna Beach California The area labeled 1st Flr Master Bedroom has a heat loss of 9138 Btuh and a Heat Gain of 4807 Btuh Manual J8AE want to provide 299 cfm for heating and less air (244 cfm) for cooling If I do the sensible heat formula CFM = Sensible Btuh / 1.1 x ∆ T , I am using 29 ∆ T for heating and 10 ∆ T for cooling I get 286 cfm for heating and more air (437 cfm) for cooling. This does not make sense to me with needing more cfm with less of a Btuh load. Can you show me where I am thrown off?

Fuck accent!

Hello, I watched the whole video and thought it was very well presented and informative. Would you mind clarifying for me for instance at 25:20 you state the ductulator shows 12 CFM @0.06 / 825 fpm. But @ 0.06 a 16" duct is factually 100 cfm and 780 fpm. On the other hand if you use the starting point 0.06 @ 1200 cfm the fpm will drop to 800 fpm and of coures you can't buy a 16.4" round duct. So factually you have to make a choice of either: 16" @ 0.07 = 1200 cfm at 850 fpm or 16" at 0.06 1100 cfm at 780 fpm. Q1: Which one would you choose or does it make any difference in the grand scheme of things? Q2: When counting up the DPL, do you count the total amount of (registers) or just one of them? For instance, I have 10 registers in a home I'm working on and 10 registers would amount to 10 x 0.03 or 0.3 all by themselves which will put over the 0.5 Unit ESP. @11:45 I didn't see you make that part clear, you spoke of "registers" but you only counted one at 0.08. Thanks for the informative video I thought it was great. Joe

I have some questions that seem straight fwd, but confusing too! I have a group of (3) Diffusers i want to use that say its max CFM is 145 each for a 12x4 unit. The Plenum box they can supply with it says it only has a 6" duct. To me this in no way would exceed 75-85CFM. So Would i size my return grill based on this max CFM of the duct from the supplies?

👍👍👍

Excellent work and Explanation dear! Good luck.

47°f = but/lb???

great video, quick and easy to understand, thanks

Excellently presented video with helpful information. У меня вопрос, брат. Вы русский? Я русско-американский иммигрант во втором поколении.

Perfect

Turning vains

Thanks boiiiii

Pl advise best software or manuals Round / circular process duct calculation including, Expansion joint, Stiffner, development, pressure drop, Load calculation on each support

Pl advise best software or manuals Round / circular process duct calculation including, Expansion joint, Stiffner, development, pressure drop, Load calculation on each support

I do not understand how you convert to equivalent feet. For example, Fitting type C3 has a correction factor or 0.11. how do you get 35' based upon the corrected pressure drop chart?

Difference in enthalpy is alternate easy method to find out the total heat gain.