I am in the process of getting my HVAC system designed. If you care to read more information please check out my thread here:
One of my returns is sized to deliver 1200 CFM, and it will be a 16" rigid pipe set behind a 24" by 24" return grille.
The supplies in the photo are 10" (14" by 14" by 10" Speedi-Boot) and are sized to each deliver 325 CFM at 0.06" WC/100ft.
Are these supplies too close to the return grille?
Please let me know if I can provide more info to help you make a determination.
Thank you for your assistance.