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DD4025 400x250mm Wall Grille Removable Core – Wall Grilles – GWDD4025
Image is for illustration only. Please go by the model number (SKU: GWDD4025).
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$108.48$170.98 (-37%)
Price Match*
Price Match*
Discount per Quantity
| Quantity | Discount | Price |
|---|
| 1 - 4 | 0% | $108.48 | |
| 5 - 9 | 8% | $99.80 | |
| 10 - 19 | 12% | $95.46 | |
| 20 + | 18% | $88.95 |
⚠️ Important Compatibility Notice
Please double-check the required specifications with your qualified technician or installer prior to ordering. Due to the technical nature of this product, incorrect orders cannot be exchanged, replaced, or refunded. Thank you for your understanding.
Professional HVAC Component: DD4025 400x250mm Wall Grille Removable Core
You are viewing the DD4025 400x250mm Wall Grille Removable Core (SKU: GWDD4025). A professional-grade component from the Wall Grilles series, engineered for New Zealand’s residential and commercial ventilation systems. Sourced directly from our trade supply chain for NZ Depot.
⚠️
Technical Verification Required
Ventilation components require precise sizing. Please verify that this GWDD4025 model matches your system’s diameter and connection type (e.g., Big End vs Small End) before ordering.
Key Specs:
Category: Wall Grilles
Type: Wall grille
Product Specifications
The GWDD4025 Aluminium Double Deflection Grille is designed for use in cooling, heating, and ventilation systems. It provides precise directional airflow control through individually adjustable blades and includes a removable core for easy installation, cleaning, and access to dampers. Constructed from durable aluminium, the grille offers long-lasting performance and a professional appearance suitable for a wide range of HVAC applications.
Application
Suitable for both supply and return air in residential, commercial, and industrial HVAC systems. Ideal for situations requiring adjustable airflow direction and straightforward maintenance. Mullions are fitted to grilles where blade lengths exceed 800 mm to ensure rigidity and airflow consistency.
Features / Benefits
- Suitable for cooling, heating, and ventilation applications
- Individually adjustable blades for precise directional airflow control
- Removable core for easy installation, cleaning, and damper access
- Mullions fitted to grilles with blade lengths exceeding 800 mm
- Durable aluminium construction for corrosion resistance and longevity
- Available in a wide range of sizes to suit most system designs
The table below gives the minimum height for a flat ceiling for satisfactory performance, base on the register being mounted between 300 and 600 mm below the ceiling for a range of flows between 3 and 20 metres
| Output Velocity (m/s) | Minimum Ceiling Height in Metres | ||||||||
| 3 | 4.5 | 6 | 7.5 | 9 | 10.5 | 12 | 15 | 18 | |
| 2.0 | 2.4 | 2.7 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 | 4.6 | 4.9 |
| 2.5 | 2.4 | 2.7 | 3.0 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 | 4.6 |
| 3.0 | 2.4 | 2.7 | 2.7 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 | 4.6 |
| 4.0 | 2.4 | 2.7 | 2.7 | 3.0 | 3.3 | 3.3 | 3.7 | 4.0 | 4.3 |
| 5.0 | 2.1 | 2.4 | 2.4 | 2.7 | 3.0 | 3.0 | 3.3 | 3.7 | 4.0 |
| 6.0 | 2.1 | 2.4 | 2.4 | 2.7 | 3.0 | 3.0 | 3.3 | 3.3 | 3.7 |
| 7.0 | 1.8 | 2.1 | 2.4 | 2.7 | 2.7 | 3.0 | 3.0 | 3.3 | 3.3 |
| 8.0 | 1.8 | 1.8 | 2.1 | 2.4 | 2.4 | 2.7 | 2.7 | 3.0 | 3.0 |
| Throw Range in Metres | |||||||||
Table 1.
The above figures are for straight blow and 22.5 degrees
For 45 degrees vane setting, deduct 300 mm from ceiling height
| Outlet Velocity (m/s) | Noise Rating (NR) | Typical Applications |
| 2.5 | 25 – 30 | Bedroom, Auditioriums |
| 3.7 | 35 – 40 | Private Office |
| 5.0 | 40 – 45 | General Office |
| 7.5 | 50 – 60 | Light Industrial |
Table 2.
Design NR Values bases on AIRAH DA2, Noise Control
| Air Volume (L/s) | Register Size | 400 x 250 | ||
| Vane Setting | 0? | 22.5? | 45? | |
| 150 | Throw (m) | 6 | 4.5 | 4 |
| Velocity (m/s) | 2 | 2 | 2.5 | |
| Static Pressure (Pa) | 2 | 2 | 3 | |
| 200 | Throw (m) | 8.5 | 7.5 | 6 |
| Velocity (m/s) | 2.5 | 3 | 3 | |
| Static Pressure (Pa) | 3.5 | 5 | 3 | |
| 250 | Throw (m) | 11 | 9 | 8 |
| Velocity (m/s) | 3 | 3.5 | 4.5 | |
| Static Pressure (Pa) | 5.5 | 7.5 | 11.5 | |
| 300 | Throw (m) | 12.5 | 10.5 | 8.5 |
| Velocity (m/s) | 3.5 | 4.5 | 4.5 | |
| Static Pressure (Pa) | 7.5 | 10.5 | 13 | |
| 350 | Throw (m) | 14.5 | 12 | 10.5 |
| Velocity (m/s) | 4.5 | 5 | 5.5 | |
| Static Pressure (Pa) | 10.5 | 14.5 | 17.5 | |
| 400 | Throw (m) | 16.5 | 14.5 | 12 |
| Velocity (m/s) | 5 | 5.5 | 6 | |
| Static Pressure (Pa) | 13.5 | 18 | 22 | |
| 450 | Throw (m) | 18 | 16 | 13.5 |
| Velocity (m/s) | 5.5 | 6.5 | 7 | |
| Static Pressure (Pa) | 16.5 | 20 | 28 | |
| 500 | Throw (m) | 21 | 18 | 15 |
| Velocity (m/s) | 6 | 7 | 8 | |
| Static Pressure (Pa) | 21 | 29 | 36 | |
| 550 | Throw (m) | 23 | 19.5 | 16.5 |
| Velocity (m/s) | 6.5 | 8 | 8.5 | |
| Static Pressure (Pa) | 25 | 36 | 43 | |
| 600 | Throw (m) | 25 | 21 | 18.5 |
| Velocity (m/s) | 7.5 | 8.5 | 925 | |
| Static Pressure (Pa) | 30 | 43 | 51 | |
Table 3.
Air Volume – Litres per Second (L/s)
Throw (m) is to a terminal velocity of 0.25m/s
Static Pressure – Pascals (Pa)
Core Velocity – Metres per Second (m/s)
Professional HVAC Supply: DD4025 400x250mm Wall Grille Removable Core
You are viewing the DD4025 400x250mm Wall Grille Removable Core (SKU: GWDD4025). A critical component within our Wall Grilles range, designed specifically for New Zealand’s residential and commercial ventilation requirements. Sourced directly from our trade supply chain for NZ Depot.
⚠️
Important: Measurement Verification
HVAC components require precise sizing. Please confirm this GWDD4025 model matches your engineer’s specifications before ordering.
Technical Specifications & Features
The GWDD4025 Aluminium Double Deflection Grille is designed for use in cooling, heating, and ventilation systems. It provides precise directional airflow control through individually adjustable blades and includes a removable core for easy installation, cleaning, and access to dampers. Constructed from durable aluminium, the grille offers long-lasting performance and a professional appearance suitable for a wide range of HVAC applications.
Application
Suitable for both supply and return air in residential, commercial, and industrial HVAC systems. Ideal for situations requiring adjustable airflow direction and straightforward maintenance. Mullions are fitted to grilles where blade lengths exceed 800 mm to ensure rigidity and airflow consistency.
Features / Benefits
- Suitable for cooling, heating, and ventilation applications
- Individually adjustable blades for precise directional airflow control
- Removable core for easy installation, cleaning, and damper access
- Mullions fitted to grilles with blade lengths exceeding 800 mm
- Durable aluminium construction for corrosion resistance and longevity
- Available in a wide range of sizes to suit most system designs
The table below gives the minimum height for a flat ceiling for satisfactory performance, base on the register being mounted between 300 and 600 mm below the ceiling for a range of flows between 3 and 20 metres
| Output Velocity (m/s) | Minimum Ceiling Height in Metres | ||||||||
| 3 | 4.5 | 6 | 7.5 | 9 | 10.5 | 12 | 15 | 18 | |
| 2.0 | 2.4 | 2.7 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 | 4.6 | 4.9 |
| 2.5 | 2.4 | 2.7 | 3.0 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 | 4.6 |
| 3.0 | 2.4 | 2.7 | 2.7 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 | 4.6 |
| 4.0 | 2.4 | 2.7 | 2.7 | 3.0 | 3.3 | 3.3 | 3.7 | 4.0 | 4.3 |
| 5.0 | 2.1 | 2.4 | 2.4 | 2.7 | 3.0 | 3.0 | 3.3 | 3.7 | 4.0 |
| 6.0 | 2.1 | 2.4 | 2.4 | 2.7 | 3.0 | 3.0 | 3.3 | 3.3 | 3.7 |
| 7.0 | 1.8 | 2.1 | 2.4 | 2.7 | 2.7 | 3.0 | 3.0 | 3.3 | 3.3 |
| 8.0 | 1.8 | 1.8 | 2.1 | 2.4 | 2.4 | 2.7 | 2.7 | 3.0 | 3.0 |
| Throw Range in Metres | |||||||||
Table 1.
The above figures are for straight blow and 22.5 degrees
For 45 degrees vane setting, deduct 300 mm from ceiling height
| Outlet Velocity (m/s) | Noise Rating (NR) | Typical Applications |
| 2.5 | 25 – 30 | Bedroom, Auditioriums |
| 3.7 | 35 – 40 | Private Office |
| 5.0 | 40 – 45 | General Office |
| 7.5 | 50 – 60 | Light Industrial |
Table 2.
Design NR Values bases on AIRAH DA2, Noise Control
| Air Volume (L/s) | Register Size | 400 x 250 | ||
| Vane Setting | 0? | 22.5? | 45? | |
| 150 | Throw (m) | 6 | 4.5 | 4 |
| Velocity (m/s) | 2 | 2 | 2.5 | |
| Static Pressure (Pa) | 2 | 2 | 3 | |
| 200 | Throw (m) | 8.5 | 7.5 | 6 |
| Velocity (m/s) | 2.5 | 3 | 3 | |
| Static Pressure (Pa) | 3.5 | 5 | 3 | |
| 250 | Throw (m) | 11 | 9 | 8 |
| Velocity (m/s) | 3 | 3.5 | 4.5 | |
| Static Pressure (Pa) | 5.5 | 7.5 | 11.5 | |
| 300 | Throw (m) | 12.5 | 10.5 | 8.5 |
| Velocity (m/s) | 3.5 | 4.5 | 4.5 | |
| Static Pressure (Pa) | 7.5 | 10.5 | 13 | |
| 350 | Throw (m) | 14.5 | 12 | 10.5 |
| Velocity (m/s) | 4.5 | 5 | 5.5 | |
| Static Pressure (Pa) | 10.5 | 14.5 | 17.5 | |
| 400 | Throw (m) | 16.5 | 14.5 | 12 |
| Velocity (m/s) | 5 | 5.5 | 6 | |
| Static Pressure (Pa) | 13.5 | 18 | 22 | |
| 450 | Throw (m) | 18 | 16 | 13.5 |
| Velocity (m/s) | 5.5 | 6.5 | 7 | |
| Static Pressure (Pa) | 16.5 | 20 | 28 | |
| 500 | Throw (m) | 21 | 18 | 15 |
| Velocity (m/s) | 6 | 7 | 8 | |
| Static Pressure (Pa) | 21 | 29 | 36 | |
| 550 | Throw (m) | 23 | 19.5 | 16.5 |
| Velocity (m/s) | 6.5 | 8 | 8.5 | |
| Static Pressure (Pa) | 25 | 36 | 43 | |
| 600 | Throw (m) | 25 | 21 | 18.5 |
| Velocity (m/s) | 7.5 | 8.5 | 925 | |
| Static Pressure (Pa) | 30 | 43 | 51 | |
Table 3.
Air Volume – Litres per Second (L/s)
Throw (m) is to a terminal velocity of 0.25m/s
Static Pressure – Pascals (Pa)
Core Velocity – Metres per Second (m/s)
About the Wall grille Series
Suitable for use in cooling, heating and ventilation applications.
Supplied with adjustable blades and removable cores as standard
Easy to install, clean and access dampers located behind registers
Mullions are fitted to all double deflections when the blade length exceeds 800mm in any direction
Large selection of sizes can be ordered to suit most applications
Additional information
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