Restore proper airflow and a clean interior look with this OEM-spec replacement plenum ceiling assembly. Designed specifically for Coleman Mach straight-thru ducting air conditioner systems, the 8430A6301 ChillGrille plenum mounts directly to your existing ceiling cutout and AC unit without modification. White finish blends with standard RV headliners.
When your existing ceiling plenum cracks, discolors, or loses its louver integrity, air distribution suffers and the interior of your RV looks worn. The Coleman Mach 8430A6301 is the factory replacement plenum assembly for straight-thru ducting configurations -- the style used on many Coleman Mach rooftop units where conditioned air flows directly down through the ceiling rather than being distributed through a full duct system.
This is a plenum only assembly -- it includes the ceiling grille housing and diffuser structure but does not include the rooftop AC unit, control box, wiring harness, or duct kit. It is the interior-facing component that snaps or fastens to the ceiling and interfaces with the air handler above.
Matched to straight-thru duct configurations common on Coleman Mach rooftop units. Airflow delivers directly through the plenum opening.
Vendor part CMN8430A6301 -- a factory Coleman Mach replacement, not an aftermarket substitute. Ensures proper fit and finish.
Standard white color matches most RV ceiling headliners and blends with the interior of Class A, Class C, and fifth-wheel trailers.
Replaces just the ceiling assembly housing. No rooftop unit, wiring, or control components included -- ideal for cosmetic or structural plenum repairs.
Coleman Mach rooftop air conditioners are offered in two interior distribution styles: ducted (air routed through ductwork to multiple vents) and straight-thru (air discharged directly through a single ceiling assembly into the living space). The straight-thru plenum is the entire ceiling-mounted grille and diffuser unit that directs airflow from the AC coil downward into the RV cabin.
Over time, UV exposure, cleaning chemicals, and physical contact can crack or warp the louvers and housing. A damaged plenum restricts airflow, reduces cooling efficiency, and creates noise. Replacing the plenum assembly restores full airflow volume and a clean appearance without replacing the entire rooftop unit.
The 8430A6301 is designed as a drop-in replacement for the corresponding Coleman Mach ceiling assembly. Most installations require only basic hand tools. The plenum fastens to the ceiling ring that remains attached to the rooftop unit -- no roof access required for the plenum swap itself.
This plenum assembly is intended for Coleman Mach rooftop air conditioners that use the straight-thru ducting ceiling configuration. It is specifically matched to systems using the 8430-series ceiling assembly interface. Verify your existing ceiling ring and rooftop unit part number before ordering to confirm fitment. Common compatible unit families include Coleman Mach 8 and Mach 10 series rooftop ACs configured for straight-thru ceiling distribution.
Coleman Mach offers both plenum-only and complete ceiling assembly kits. The plenum-only option (this part) replaces just the interior housing and grille. If your ceiling ring, wiring connections, or mounting hardware are also damaged, you may need the full ceiling assembly kit instead. Inspect your existing hardware before ordering.
This plenum is not compatible with Coleman Mach ducted distribution systems. Ducted configurations use a different ceiling assembly with separate supply and return ports routed to ductwork. Confirm your RV uses straight-thru (single-point discharge) ducting before purchasing this part.
When replacing the plenum, inspect the foam gasket between the ceiling assembly and rooftop unit for compression or cracking. A failed gasket allows warm attic air to mix with conditioned air and reduces cooling performance. Replace the gasket if it shows any signs of deterioration.