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Drop Box Concentric Diffuser


Our Drop Box Concentric Diffuser is designed to distribute and direct air from drop ceilings side supply air discharge with grill on the bottom in t-bar or plaster ceilings. This light-weight design features 4-way adjustable even supply airflow, aluminum egg crate return grill, insulated duct pans. The unit comes fully assembled, sealed and insulated with mounting brackets installed.


  • Designed for drop-down side supply air discharge installations in t-bar or plaster ceilings
  • Material: G-90 Galvanized Steel
  • Fully assembled, sealed, and insulated
  • Lightweight design with mounting brackets installed
  • 4-way even supply air flow
  • Aluminum egg crate return grille
  • Exposed surfaces painted off-white enamel
  • Insulated duct pans included
  • Flex duct supplied by others

About Us

We work hand-in-hand with our customers to create the best products using our team of professionals with more than 50 years of experience. We look forward to a challenge and believe each customer deserves the utmost attention and care with a total commitment to 100% customer satisfaction. We understand that it’s not just the quality that matters, but the service, craftsmanship and expertise that makes the difference.

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