Air Grilles for HVAC Systems


The new Polyaire MDO-S (Multi Directional Outlet - Square) is the latest addition in our family of grilles.

It is a ceiling diffuser which can direct air flow for complete control and comfort using unique adjustable air flow grilles. It is also crucial in the installation of an evaporative cooling system. It is made from high impact engineering grade plastic which will not chip, fade, corrode or discolour over time.


Item #DescriptionNominal Neck Size (mm/inch)Face Size (mm/inch)
2318004 Way230x230 / 9x9283x283 / 11x11
2318014 Way300x300 / 12x12353x353 / 14x14
2318024 Way350x350 / 14x14408x408 / 16x16
2318034 Way400x400 / 16x16456x456 / 18x18


  • Made from tough engineering grade plastic.
  • Comes in four sizes – 230, 300, 350 and 400.
  • Shares the same biscuits as the current MDO-X.
  • The same face and neck sizes as the current MDO-X.
  • Square corners on the face.
  • The same etching pattern on the face as the current MDO-X.
  • Four spring loaded clips with locking mechanism at the corners.

MDO-S Kits

Item #Nominal Neck Size (mm/inch)Spigot Size (mm/inch)
231812230x230 / 9x9Ø150 / Ø6
231813230x230 / 9x9Ø200 / Ø8
231814300x300 / 12x12Ø200 / Ø8
231815300x300 / 12x12Ø250 / Ø10
231816300x300 / 12x12Ø300 / Ø12
231817350x350 / 14x14Ø300 / Ø12
231818350x350 / 14x14Ø350 / Ø14
231821400x400 / 16x16Ø350 / Ø14
231822400x400 / 16x16Ø400 / Ø16
231825350x350 / 14x14Ø400 / Ø16

More features:

  • Delivers air flow with directional control adjustment from the room.
  • Low resistance to airflow (correct installation).
  • Fits various ceiling types and thickness.
  • Suitable for all wet areas.
  • Easy to clean.
  • Will not corrode and is suitable for high salt content areas.
  • A softer, more contemporary appearance with wider flanges, fillet corners and edges.
  • Snap-In feature holds the biscuit firmly – less likelihood of dislodging when adjusting or cleaning

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