{"title":"Plenums","description":null,"products":[{"product_id":"plenum-for-hvac-galvanized-aluminum-or-stainless-steel","title":"Rectangular HVAC Plenum Box or Return Air Plenum Box | Galvanized, Aluminum, or Stainless Steel","description":"\u003cp data-end=\"574\" data-start=\"254\"\u003eBuild a reliable foundation for your HVAC system with a custom Rectangular Plenum or Air Return. Designed to manage high airflow while reducing energy loss, this component helps deliver balanced ventilation and consistent comfort. 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