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DD3515 350x150mm Wall Grille Removable Core – Wall Grilles – GWDD3515
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Professional HVAC Component: DD3515 350x150mm Wall Grille Removable Core
You are viewing the DD3515 350x150mm Wall Grille Removable Core (SKU: GWDD3515). A professional-grade component from the Wall Grilles series, engineered for New Zealand’s residential and commercial ventilation systems. Sourced directly from the Smooth Air supply chain for NZ Depot.
⚠️
Technical Verification Required
Ventilation components require precise sizing. Please verify that this GWDD3515 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 GWDD3515 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 degree
For 45 degree 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 | 350 x 150 | ||
| Vane Setting | 0? | 22.5? | 45? | |
| 100 | Throw (m) | 6 | 5 | 4 |
| Velocity (m/s) | 2.5 | 3 | 3.5 | |
| Static Pressure (Pa) | 4 | 5 | 6 | |
| 125 | Throw (m) | 7.5 | 6.5 | 4 |
| Velocity (m/s) | 3.5 | 3.5 | 3.5 | |
| Static Pressure (Pa) | 6 | 7 | 6 | |
| 150 | Throw (m) | 9 | 8 | 6.4 |
| Velocity (m/s) | 4 | 4 | 5 | |
| Static Pressure (Pa) | 8 | 11 | 14 | |
| 200 | Throw (m) | 11 | 10.5 | 8.5 |
| Velocity (m/s) | 5 | 6 | 6.5 | |
| Static Pressure (Pa) | 14 | 19 | 24 | |
| 250 | Throw (m) | 15 | 12.5 | 10.5 |
| Velocity (m/s) | 6 | 7 | 8 | |
| Static Pressure (Pa) | 23 | 29 | 36 | |
| 300 | Throw (m) | 17.9 | 15.1 | 13 |
| Velocity (m/s) | 7.5 | 8.5 | 9.5 | |
| Static Pressure (Pa) | 33 | 43 | 54 | |
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)
Products specifications
| Attribute name | Attribute value |
|---|---|
| Grille Specifications | |
| Installation location | Wall |
| Application | Commercial & Domestic |
| Shape | Rectangle |
| Material | Aluminium |
| Colour | White |
| Finish | Powder Coated |
| Face Size (mm) | 397 x 197 |
| Neck Size (mm) | 150 x 350 |
| Depth (mm) | 61 |
Why NZ DEPOT for HVAC?
🏭
Trade Pricing
We strip out the showroom markup. You pay for the Wall Grilles quality, not the retail overheads.
🚚
Site Delivery
Direct dispatch to your home or job site. We use specialized freight for bulky ducting and fragile components.
✅
NZ Standards
Genuine NZ market product. Fully compliant with local building and ventilation codes.
Technical Insight: Optimizing Ventilation Systems in NZ
Maximizing Airflow Efficiency
Whether you are installing a bathroom extractor, a range hood, or a full balanced pressure heat recovery system, the physics of airflow remains the same: air hates friction. Every component in your system, from the ducting to the joiners and grilles, introduces “Static Pressure” (resistance).
Using high-quality components like the DD3515 350x150mm Wall Grille Removable Core is crucial for minimizing this resistance. Cheaper, poorly molded fittings or rough-bore ducting can create turbulence, which reduces the extraction rate of your fan. This means your fan has to work harder, creating more noise and using more electricity, while moving less damp air out of your home.
Pro Tip: When connecting ducting, always stretch flexible ducting taut. A saggy duct creates immense resistance. Use rigid joiners and bends where possible to maintain a smooth internal profile for the air to glide over.
Building Code G4 & Healthy Homes Standards
In New Zealand, ventilation isn’t just about comfort; it’s a compliance issue. Under Building Code Clause G4, spaces where people live must have adequate ventilation to prevent mold and moisture buildup. The Healthy Homes Standards further enforce this for rental properties, requiring specific extraction capacities for kitchens and bathrooms.
Ensuring you use the correct diameter components (like 150mm for kitchens) is vital. Using a restrictive component in a 150mm system effectively chokes it down, potentially causing it to fail a flow test. Smooth Air products are designed to meet AS/NZS 4254 standards, giving you peace of mind that your installation is up to code.
Material Selection: PVC vs. Galvanized Steel
Choosing between plastic (PVC) and metal components depends on the application.
- PVC (Plastic): Ideal for residential use, especially in bathroom and laundry extracts. It is lightweight, immune to corrosion (rust), and has a very smooth internal surface for excellent airflow. It helps reduce vibration noise transfer.
- Galvanized Steel: The standard for commercial HVAC and high-temperature applications. It offers superior structural rigidity and fire resistance. If your system passes through fire-rated walls, steel components (often combined with fire dampers) are non-negotiable.
This specific item, the DD3515 350x150mm Wall Grille Removable Core, utilizes materials selected for durability and performance in its intended class.
Logistics & Warranty
Secure Shipping: We utilize a “Direct-to-Site” 3PL model. Your order for the GWDD3515 is routed from the nearest strategic distribution hub (Auckland, Wellington, or Christchurch) directly to your address. This reduces road miles and handling, ensuring your parts arrive in pristine condition.
NZ Warranty: As a 100% NZ-owned business, all purchases are covered by the Consumer Guarantees Act. Whether you are a trade professional or a DIY homeowner, you are protected against manufacturing defects.
© 2026 NZ DEPOT Limited. All Rights Reserved. | 100% NZ Owned & Operated.
Professional HVAC Supply: DD3515 350x150mm Wall Grille Removable Core
You are viewing the DD3515 350x150mm Wall Grille Removable Core (SKU: GWDD3515). A critical component within our Wall Grilles range, designed specifically for New Zealand’s residential and commercial ventilation requirements. Sourced directly from the Smooth Air supply chain for NZ Depot.
⚠️
Important: Measurement Verification
HVAC components require precise sizing. Please confirm this GWDD3515 model matches your engineer’s specifications before ordering.
Dimensions: Length: mm | Width: mm | Height: mm.
Technical Specifications & Features
The GWDD3515 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 degree
For 45 degree 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 | 350 x 150 | ||
| Vane Setting | 0? | 22.5? | 45? | |
| 100 | Throw (m) | 6 | 5 | 4 |
| Velocity (m/s) | 2.5 | 3 | 3.5 | |
| Static Pressure (Pa) | 4 | 5 | 6 | |
| 125 | Throw (m) | 7.5 | 6.5 | 4 |
| Velocity (m/s) | 3.5 | 3.5 | 3.5 | |
| Static Pressure (Pa) | 6 | 7 | 6 | |
| 150 | Throw (m) | 9 | 8 | 6.4 |
| Velocity (m/s) | 4 | 4 | 5 | |
| Static Pressure (Pa) | 8 | 11 | 14 | |
| 200 | Throw (m) | 11 | 10.5 | 8.5 |
| Velocity (m/s) | 5 | 6 | 6.5 | |
| Static Pressure (Pa) | 14 | 19 | 24 | |
| 250 | Throw (m) | 15 | 12.5 | 10.5 |
| Velocity (m/s) | 6 | 7 | 8 | |
| Static Pressure (Pa) | 23 | 29 | 36 | |
| 300 | Throw (m) | 17.9 | 15.1 | 13 |
| Velocity (m/s) | 7.5 | 8.5 | 9.5 | |
| Static Pressure (Pa) | 33 | 43 | 54 | |
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)
Products specifications
| Attribute name | Attribute value |
|---|---|
| Grille Specifications | |
| Installation location | Wall |
| Application | Commercial & Domestic |
| Shape | Rectangle |
| Material | Aluminium |
| Colour | White |
| Finish | Powder Coated |
| Face Size (mm) | 397 x 197 |
| Neck Size (mm) | 150 x 350 |
| Depth (mm) | 61 |
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
Understanding NZ HVAC Compliance
When selecting ventilation equipment for New Zealand homes and businesses, compliance with AS/NZS 4254 and UL 181 standards is non-negotiable. The DD3515 350x150mm Wall Grille Removable Core is engineered to meet these rigorous safety and performance benchmarks.
Why R-Value Matters
For insulated ducting components, the R-Value (Thermal Resistance) is critical. A higher R-Value ensures that the air travelling through your system maintains its temperature—whether hot or cold—from the unit to the outlet. This reduces energy load on your heat pump or AC unit, lowering electricity bills and increasing system longevity. This product offers an R-Value of (if applicable), ensuring thermal efficiency.
Fire Safety & Materials
Safety is paramount in ceiling spaces and wall cavities. Smooth Air components utilize fire-resistant materials, often featuring a metallized Mylar outer jacket and encapsulated steel wire cores. This construction not only prevents fire spread but also maintains the structural integrity of the ducting under high pressure.
Why NZ DEPOT for HVAC?
🏭
Trade Pricing
We strip out the showroom markup. You pay for the Wall Grilles quality, not the retail overheads.
🚚
Site Delivery
Direct dispatch to your home or job site. We use specialized freight for bulky ducting and fragile components.
✅
NZ Standards
Genuine NZ market product. Fully compliant with local building and ventilation codes.
🌱 Sustainable Supply Chain Initiative
At NZ DEPOT, we are modernizing the New Zealand trade supply chain. Traditional retail involves shipping products from a manufacturer to a central warehouse, then to a retail showroom, and finally to the customer. This “multi-hop” model adds unnecessary carbon emissions and cost.
By utilizing a Direct-to-Site 3PL model, we eliminate the “Showroom Hop.” Your order for the GWDD3515 is routed from the nearest strategic distribution hub (Auckland, Wellington, or Christchurch) directly to your address. This logistical efficiency reduces road miles, lowers our carbon footprint, and allows us to pass significant savings on to you.
🛡️ Warranty & Consumer Protection
Consumer Guarantees Act (CGA)
We are a 100% New Zealand-owned and operated entity. All purchases made through NZ Depot are fully covered by the Consumer Guarantees Act 1993. Whether you are buying for personal use or commercial fit-out, you are protected against manufacturing defects and faults.
Secure Transaction Promise
Your security is paramount. We utilize industry-standard SSL encryption for all data transmission. We do not store credit card details locally; all payments are processed via secure, PCI-compliant gateways.
© 2026 NZ DEPOT Limited. All Rights Reserved. | 100% NZ Owned & Operated.
Additional information
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Reviews
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| 4 star | 60% | |
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