Cushion Box Metal Internally Insulated
The metal internally insulated cushion box is a sheet metal plenum box used in ducted air conditioning and HVAC systems to connect supply air grilles, diffusers, and registers to the duct system. The internal insulation lining controls condensation, reduces thermal loss, and dampens airflow noise — making it the standard choice for supply, return, and transfer air applications in residential and commercial ducted air conditioning installations.
Constructed from galvanised steel for long-lasting corrosion resistance, the cushion box is designed to sit between the flexible duct spigot and the face of the grille or diffuser, providing a secure, insulated plenum that ensures even air distribution into the room. The internal insulation prevents heat transfer through the box walls and reduces the risk of condensation forming on the outer surface in high humidity environments.
Available in multiple sizes to suit a wide range of standard grille, diffuser, and register face sizes, these cushion boxes are a standard item on residential and light commercial ducted air conditioning installations across Australia.
Key features:
Internally insulated for thermal efficiency and condensation control
Galvanised steel construction for corrosion resistance and durability
Reduces airflow noise through the air conditioning plenum
Suitable for supply, return, and transfer air applications
Compatible with standard air conditioning grilles, diffusers, and registers
Available in multiple sizes to suit your installation
Standard component for residential and commercial ducted air conditioning systems
