Coleman-Mach 9470-4231 ChillGrille Bottom-Discharge Kit

The Coleman-Mach ChillGrille shroud, part number 9470-4231, is a purpose-built conversion kit for your RV's rooftop air conditioner. If you've already got a 9430D715 ceiling assembly installed and you want to change how the cold air comes into the coach, this is the piece that does it. It converts that assembly over to a bottom-discharge setup, and it's finished in white to blend into a typical RV ceiling.

Let me explain what that actually changes. In its standard form, a non-ducted ceiling assembly spreads conditioned air out across the ceiling. A bottom-discharge conversion sends that air straight down through the grille instead. For a lot of floor plans that's exactly what you want. Cold air dropping right into the living space instead of hugging the ceiling and taking its time to reach you. It's a small change on paper, but it makes a real difference in how a coach feels on a hot afternoon.

The ChillGrille name refers to Coleman-Mach's interior ceiling and air-distribution hardware for their non-ducted rooftop units. A non-ducted system is the common setup on a lot of single-zone RVs, where the rooftop air conditioner blows directly into the living space through the ceiling assembly rather than through ductwork routed across the roof. Because there's no duct network to reroute, changing the discharge pattern comes down to the ceiling assembly and its grille, and that's exactly what this kit addresses.

This kit is specific. It's built to convert the 9430D715 ceiling assembly and nothing else, and it doesn't replace that assembly. It works with it. You keep the ceiling assembly you already have and add this shroud to redirect the discharge. Coleman-Mach has run several ceiling assembly versions over the years, so the numbers matter. If you're not sure which assembly is in your rig, pull the interior grille and check the part number before you order. Getting the right conversion kit for your specific assembly is what makes this a five-minute win instead of a return.

Install is straightforward for anyone comfortable working overhead. You're at the interior ceiling here, not up on the roof, so you don't need to pull the rooftop unit or break into the refrigerant side of the system. Coleman rates this as an easy install. Take your time, support the assembly while you work, and go easy on the fasteners. The mounting points are plastic, and they'll crack if you crank down on them, so snug is better than tight.

Where does a bottom-discharge conversion earn its keep? Think about a bedroom or a smaller cabin area where you want the cold air to fall onto the bed or the seating rather than run along the ceiling. Think about a coach where the airflow never quite seemed to reach the middle of the room. This is a low-cost way to redirect that air without replacing the whole ceiling assembly or the rooftop unit. For the money, it's one of the simpler comfort upgrades you can make to a Coleman-Mach non-ducted system.

A couple of things worth thinking through before you order. First, make sure a focused, straight-down airflow is what you actually want, because bottom discharge concentrates the air rather than spreading it. Second, check your clearance at the ceiling so the converted grille sits flush and clean. And third, if your interior is light colored, the white finish this kit ships in will match right in. It carries a limited 90-day supplier warranty, and it's genuine Coleman-Mach hardware, so it fits and finishes the way the factory intended. If you're running a 9430D715 assembly and bottom discharge is what your floor plan needs, this is the correct kit to get you there.