Keep your RV's ducted cooling system sealed and performing as designed. This OEM-spec long fabric duct collar package from Coleman Mach is the correct replacement for ducted 9330, 9370, 9470, 9530, and 9630 series rooftop air conditioner units that route conditioned air through the ceiling duct system rather than a non-ducted ceiling assembly.
Coleman Mach rooftop air conditioners in the 9000 series come in both ducted and non-ducted configurations. The ducted versions rely on a fabric duct collar to create an airtight transition between the unit's air plenum and the RV's ceiling duct network. Over time, this fabric collar can tear, sag, compress, or delaminate -- especially in rigs that see heavy seasonal use or large temperature swings.
Part number 9330A4531 is the long-style fabric collar package engineered specifically for these models. Using the correct collar length matters: a short collar on a long-collar application leaves gaps in the air path, reducing cooling efficiency and allowing warm, unconditioned air to re-enter the supply stream. This package includes the fabric collar and associated hardware needed to restore the duct connection to factory spec.
Direct replacement sourced from Coleman Mach -- matches factory dimensions and attachment points exactly.
The extended length bridges deeper ceiling assemblies and plenum cavities found in ducted 9000-series installations.
Confirmed fit across 9330, 9370, 9470, 9530, and 9630 series units that use the fabric duct collar design.
A properly seated collar eliminates air bypass around the duct opening, delivering full rated BTU output to living spaces.
In a ducted RV air conditioning setup, conditioned air leaving the evaporator coil travels through a transition collar into the ceiling duct plenum before being distributed through registers throughout the coach. The fabric collar flexes slightly to accommodate vibration and minor positional variation between the rooftop unit and the ceiling cutout. It also acts as a gasket -- preventing warm attic-space air from mixing with supply air.
When the collar fails, symptoms include uneven cooling, reduced airflow at registers, and in some cases condensation or moisture intrusion around the ceiling assembly. Replacing the collar is a straightforward repair that restores system performance without requiring a full unit replacement.
While the ceiling assembly is open for collar replacement, inspect the duct plenum gasket and ceiling assembly foam seal for compression damage. Coleman Mach recommends replacing worn foam gaskets at the same time to ensure a complete air seal between the rooftop unit base and the ceiling cutout.
Before ordering, verify your unit uses a ducted ceiling assembly. Ducted systems route air through the ceiling and distribute it via registers; non-ducted systems deliver air directly from the ceiling assembly grille into the living space. The presence of a fabric collar in the existing ceiling assembly is the quickest confirmation that this part applies to your unit.
Collar replacement is typically performed from inside the coach. The ceiling assembly grille and inner cover are removed to access the collar attachment. The old collar is unfastened, the new collar is positioned over the plenum opening, and the retaining hardware is secured. No rooftop access is required for the collar swap itself, though rooftop inspection of the unit base gasket is recommended whenever the ceiling assembly is open.
Coleman Mach recommends inspecting duct collar condition annually, particularly before and after storage seasons. UV exposure, ozone, and temperature cycling degrade fabric collar material over time. Early replacement prevents air bypass from quietly reducing system efficiency for an entire cooling season.