Return Air Box with Grille and Filter, 14" x 30" for 3-3 1/2 System, used on all MB3642 and MC3642 units, Includes throwaway filter, two duct bands, and clips.
Return Air Box with Grille and Filter, 14" x 22" for 2-2 1/2 System, used on all MB2430 and MC2430 units, Includes throwaway filter, two duct bands, and clips.
Return Air Box with Grille and Filter, 24" x 30" for 4-5 System, used on all MB4860 and MC4860 units, Includes throwaway filter, two duct bands, and clips.
Plenum Ducts are incredibly long lasting return and supply ducts used with high velocity HVAC systems. When combined with Unico HVAC, plenum ductwork offers some of the best heating and cooling a high velocity system can achieve.
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95% DOP and HEPA/ULPA Filters 
