How to Size Return Air Grilles?

Return air grille is an essential piece of equipment in HVAC. However, when you want to buy a new return air grille, you'll often find that the airflow of the grille is not specified. So, how do you know what size of return air grille you should buy? In this video, I'll share with you how we size return air grilles.
About the creator:
Yu has 10 years of experience in HVAC. He used to design, execute installation, manage projects, troubleshoot and maintain HVAC systems. Now, he is focusing on creating contents that can help homeowners and engineers to solve their HVAC problems.

[@mohdkhaled9895]

Hi sir, You are an OG of HVAC I'm working as Hvac design engineer for last 3 years, you are my inspiration to be in design field, and I really value your knowledge of Hvac in design, Thank you so much sir, looking forward for such videos (I want Kitchen Ecology unit, make up air unit calculations)

[@lendssadiasa4814]

Best video😊, hoping you can upload more videos about hvac design

[@davef.2329]

Good to know, thanks.

[@BigSemmie]

Good Morning, at the end of your presentation on grills you commented on dealing with noise from air handlers at the grill, which of presentations were you referring to. Thank you

[@aircondlounge]

Morning, I yet to publish a video on that topic. Will upload in the future. Thanks.

[@kangethewakamau5771]

YOU ARE THE BEST

[@IFD1012]

🙏🏻🙌🏻

[@whitefalcon017]

Amazing video. I'm not even in HVAC and I used it to calculate a decorative grill size. I'm pushing the 800 fpm limit. Other than noise, is there a risk of my decorative cover blocking too much air to the unit?

[@aircondlounge]

Thanks. Other than noise, pushing the FPM higher will lead to higher pressure drop which is the air resistance that could slow down the AC fan speed (which reduces the overall airflow). However, we’re talking about prolonged length like a duct. One or two grilles that increases from 500 to 800 FPM wouldn’t have a noticeable difference.

[@whitefalcon017]

@@aircondlounge what about if the decorative grill is used to replace the air return grill cover? Am I going to starve the furnace from pulling in enough air? What are the risks I run here?

[@aircondlounge]

@@whitefalcon017 ​​⁠ it’s best to check with the grille supplier about the free area and then calculate the required grille size in order not to affect the system

[@xiaomix2983]

Your not uploading new videos?

[@aircondlounge]

Probably continue on December. Now preparing to launch a new course.

[@xiaomix2983]

Always visit your channel if there's a new upload.