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Grilles and diffusers
Supply and return air fittings for ducted heat pumps, ventilation systems and extract fans: floor registers, ceiling and swirl diffusers, return air panels with filters, wall, door and outside air vents, plus the grille boxes and adaptors that join them to the duct. Prices include GST.
Types
| Type | Where it goes |
|---|---|
| Floor grilles | Floor registers for underfloor ducting in metal finishes (white, beige, cream, charcoal black, antique brass) and oak, with matching floor grille boots. |
| Ceiling diffusers, swirl diffusers and metal disc valves | Supply air into rooms from a ceiling duct. Round, square and multi directional outlets, many with dampers. |
| Return air grilles and egg crate grilles | Air back to a ducted heat pump. Hinged filter versions take a panel filter you can change. |
| Wall grilles and door grilles | Transfer air between rooms, with opposed blade dampers to balance the flow. |
| External ventilation grilles | Outside air louvres, wall cowls and fascia vents where a fan or ventilation duct leaves the house. |
| Grille boxes and adaptors | Echidna and TD grille boxes, plastic neck adaptors and tension springs that connect a grille to round duct. |
| Commercial air distribution | Linear slot diffusers and tube diffusers for offices and shops. |
Measuring for a grille
A grille is usually sized by the neck, the part that fits into the ceiling, wall or duct. The face is larger and covers the edge of the hole. For example, a 595 mm egg crate grille has a 543 mm neck. Measure the opening, not the face of the old grille, and check the neck size in the product name.
Common questions
What is the difference between a supply and a return grille?
A supply grille or diffuser blows conditioned air into the room. A return grille lets air back to the unit, usually through a filter. The return side is usually larger, so the air passes through slowly and quietly.
Can I fit a filter to a return grille?
Yes. Hinged filter egg crate models take a panel filter, and replacement filters are listed in the same section.
Outside air vents and extract fans sit under the Building Code ventilation rules on MBIE’s G4 Ventilation page.
Ranges and sizes from our live catalogue, checked 28/10/2026.