Round Ceiling (Cone) Diffuser ⌀30cm

The Melbourne Vent Company

Qty Price
Buy 1 $41.00 ea
Buy 2 $38.95 ea
Buy 8 $36.90 ea
Buy 15 $34.85 ea
Buy 20 $32.80 ea

Key features
Neck Size ⌀300mm (How to measure neck size)
Face Size ⌀441mm (How to measure face size)
Material ABS moulded plastic
Colours available White
Adjustable Yes
Mounting Spring loaded clips moulded into neck
Duct adaptor sizes available No seperate adaptor required, adaptor moulded into vent.
Suitable for Reverse cycle ducted, Gas ducted heating
Product Description

Round Ceiling (Cone) Diffuser

Round Ceiling (Cone) Diffusers are an attractive alternative to using conventional MDO’s or Downjet ceiling vents for your ducted heating or cooling system. Designed to evenly distribute air around a room without creating any noticeable draughts, their design reduces resistance upon the airflow which provides an excellent supply of air while remaining almost silent.

Manufactured from high quality A.B.S plastic, Cone Diffusers are easy to clean and is finished in a non-reflective textured surface which is scratch and chip resistant, and will not corrode or rust over time. With a pleasing appearance once installed, these grilles will look great in any room in the house.

Simple to install into most plaster ceilings (up to 20mm thick), spring loaded clips hold the grille firmly into place without the need for additional fixings or screws. Once in place they are flush mounted with no gaps to the ceiling. And as an added bonus, as there is no aligning straight edges with walls, round vents are always easier to fit than square!

Incrementally adjustable for complete control, the airflow can be increased by winding out the centre cone or alternatively wound in to reduce the airflow or shut off entirely.

With the duct adaptor being moulded into vent, there is no need for a separate part to connect your existing duct work. Just select the neck size required and install!

If you have any further questions or queries, please feel free to contact us here or email directly to

Item # Description Face Size 
Neck Size
E-RCD15 Round Ceiling Diffuser ⌀15cm ⌀265⌀10 ⌀150⌀6
E-RCD20 Round Ceiling Diffuser ⌀20cm ⌀318 ⌀13 ⌀200 ⌀8
E-RCD25 Round Ceiling Diffuser ⌀25cm ⌀390 ⌀15 ⌀250 ⌀10
E-RCD30 Round Ceiling Diffuser ⌀30cm ⌀441 / ⌀17 ⌀300 / ⌀12


Not Sure what these measurements mean? Read up on how to measure vents and grilles here: