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Plenums

HVAC plenums are essential for distributing air efficiently in ducted air conditioning and heat pump systems. Selecting the right plenum ensures balanced airflow, quieter operation, and overall system performance.

Our range is designed to suit different indoor unit capacities, making it easy to choose the right option for your installation:

  • Mini Plenums — suited to indoor units up to 4.9kW
  • Standard Plenums — suited to indoor units 5.0kW and above
  • Large Body Plenums — for higher airflow requirements and specialised applications

All plenums are available in multiple configurations, including base units, pre-fitted spigots, and dampered outlets, helping streamline installation while maintaining control over airflow.

Manufactured onsite in our factory, using quality materials, our plenums are built for durability, consistency, and fast installation across a wide range of residential and commercial projects.

Need something specific? We also offer custom plenum fabrication to suit unique layouts and system requirements.

Mini Plenums — For units up to 4.9kW
Standard Plenums — For units 5.0kW and above
Large Body Plenums
Custom & Accessories
List Photos
Code Product Price Min.
Quantity		 Status Quantity
CSO150 CSO150 Castellated OVAL Spigot 150Ø
RRP $24.00
$20.87
  • Initial price : $20.87
  • [ 1 - 49 ] : $20.87
  • [ 50 - 99 ] -3.0% : $20.24
  • [ 100 + ] -5.0% : $19.83
0 Manufactured 1-2 Days
CSO200 CSO200 Castellated OVAL Spigot 200Ø
RRP $24.00
$20.87
  • Initial price : $20.87
  • [ 1 - 99 ] : $20.87
  • [ 100 + ] : $16.43
0 Manufactured 1-2 Days
CSO250 CSO250 Castellated OVAL Spigot 250Ø
RRP $24.00
$20.87
  • Initial price : $20.87
  • [ 1 - 99 ] : $20.87
  • [ 100 + ] : $16.43
0 Manufactured 1-2 Days
CSO300 CSO300 Castellated OVAL Spigot 300Ø
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
0 Manufactured 1-2 Days
CSO350 CSO350 Castellated OVAL Spigot 350Ø
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
0 Manufactured 1-2 Days
CSO400 CSO400 Castellated OVAL Spigot 400Ø
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
0 Manufactured 1-2 Days
CSO450 CSO450 Castellated OVAL Spigot 450Ø
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
0 Manufactured 1-2 Days
CS150 CS150 Castellated Spigot 150Ø
RRP $16.75
$14.57
  • Initial price : $14.57
  • [ 1 - 49 ] : $14.57
  • [ 50 - 99 ] -3.0% : $14.13
  • [ 100 + ] -5.0% : $13.84
0 Available from Stock
CS200 CS200 Castellated Spigot 200Ø
RRP $18.70
$16.26
  • Initial price : $16.26
  • [ 1 - 49 ] : $16.26
  • [ 50 - 99 ] -3.0% : $15.77
  • [ 100 + ] -5.0% : $15.45
0 Available from Stock
CS250 CS250 Castellated Spigot 250Ø
RRP $20.60
$17.91
  • Initial price : $17.91
  • [ 1 - 49 ] : $17.91
  • [ 50 - 99 ] -3.0% : $17.37
  • [ 100 + ] -5.0% : $17.01
0 Available from Stock
Manufactured 1-2 Days
Castellated OVAL Spigot 150Ø CSO150
RRP $24.00
$20.87
  • Initial price : $20.87
  • [ 1 - 49 ] : $20.87
  • [ 50 - 99 ] -3.0% : $20.24
  • [ 100 + ] -5.0% : $19.83
Manufactured 1-2 Days
Castellated OVAL Spigot 200Ø CSO200
RRP $24.00
$20.87
  • Initial price : $20.87
  • [ 1 - 99 ] : $20.87
  • [ 100 + ] : $16.43
Manufactured 1-2 Days
Castellated OVAL Spigot 250Ø CSO250
RRP $24.00
$20.87
  • Initial price : $20.87
  • [ 1 - 99 ] : $20.87
  • [ 100 + ] : $16.43
Manufactured 1-2 Days
Castellated OVAL Spigot 300Ø CSO300
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
Manufactured 1-2 Days
Castellated OVAL Spigot 350Ø CSO350
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
Manufactured 1-2 Days
Castellated OVAL Spigot 400Ø CSO400
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
Manufactured 1-2 Days
Castellated OVAL Spigot 450Ø CSO450
RRP $26.00
$22.61
  • Initial price : $22.61
  • [ 1 - 49 ] : $22.61
  • [ 50 - 99 ] -3.0% : $21.93
  • [ 100 + ] -5.0% : $21.48
Available from Stock
Castellated Spigot 150Ø CS150
RRP $16.75
$14.57
  • Initial price : $14.57
  • [ 1 - 49 ] : $14.57
  • [ 50 - 99 ] -3.0% : $14.13
  • [ 100 + ] -5.0% : $13.84
Available from Stock
Castellated Spigot 200Ø CS200
RRP $18.70
$16.26
  • Initial price : $16.26
  • [ 1 - 49 ] : $16.26
  • [ 50 - 99 ] -3.0% : $15.77
  • [ 100 + ] -5.0% : $15.45
Available from Stock
Castellated Spigot 250Ø CS250
RRP $20.60
$17.91
  • Initial price : $17.91
  • [ 1 - 49 ] : $17.91
  • [ 50 - 99 ] -3.0% : $17.37
  • [ 100 + ] -5.0% : $17.01