Proper Selection & Sizing of Return Air Grilles

Hello guys, in this video I will be discussing about the selection of Return air Grille and take a look at how to properly specify them in different method for a total design tonnage of airflow.

return grilles are used and connected to return air duct which allow air to return to cooling or heating system.

[Wilderness-Improvised]

Excellent work and Explanation dear! Good luck.

[jefftee]

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

[apsalmofdavid]

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

[iamEmanSWK]

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

[Espiritiv]

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?

[ericg.magnaye]

Can you please share the table you use? Thanks

[rat.y]

Can you please share the table you use? and why we need to divide by 0.5 sq.in .thanks sir

[kennybakerhvacr]

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

[robertgranafei]

Sounds just like an engineer ; totally confusing.

[correctingculture]

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