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Systemair RAW 400 / 450 Horizontal Discharge Roof Cowl – GRP Weatherproof Roof Terminal
The Systemair RAW 400 / 450 Horizontal Discharge Roof Cowl is a heavy-duty commercial roof ventilation terminal manufactured from UV-stabilised glass reinforced polyester (GRP), providing exceptional corrosion resistance, structural rigidity, and long-term weather protection in exposed rooftop environments.
Ideal for large commercial and industrial ventilation systems, this horizontal discharge roof cowl can be used as a passive terminal or paired with a Systemair AW plate axial fan to create a powered extract or supply ventilation solution—perfect for factories, schools, kitchens, leisure centres and plant rooms.
✅ Key Features & Benefits
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UV-Stabilised GRP Construction – Lightweight, corrosion-free and suitable for harsh outdoor conditions
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Horizontal Discharge Design – Directs airflow efficiently away from the roof surface
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Bird Guard Included – Prevents debris and wildlife ingress as standard
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Terminal or Powered Installation – Use alone or combine with an axial fan
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Architectural Colour Options – Available in BS or RAL colours on request
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Commercial-Grade Quality – Manufactured by Systemair and backed by a 1-year warranty
🏭 Suitable Applications
Ideal for:
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Factory and warehouse ventilation
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Commercial kitchens
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Schools and colleges
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Leisure facilities and sports halls
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Plant rooms
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General extract or supply systems
⚙️ Installation Options
The RAW 400 / 450 roof cowl may be installed:
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As a stand-alone roof terminal, or
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In conjunction with a Systemair AW plate axial fan to form a powered ventilation unit.
🔧 Optional Accessories
Compatible accessories include:
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Back Draught Shutter – Prevents reverse airflow when the fan is switched off
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Purlin Box – Creates a secure roof upstand for mounting
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Soaker Sheet – Matches roof profiles for a watertight installation
🎨 Finish & Colour Options
Supplied as standard in BS 00 A 05 Goosewing Grey.
Alternative finishes in any BS or RAL colour are available at additional cost—ideal for architectural or project-specific specifications.
📊 Technical Specifications
| Specification | Detail |
|---|---|
| Brand | Systemair |
| Mounting | Roof Mounted |
| Construction | UV-Stabilised GRP |
| Colour | Goosewing Grey (Standard) |
| Warranty | 1 Year Manufacturer |
| Bird Guard | Included |
| Weight | 12 kg |
| Dimensions (H × W × D) | 460 mm × (755 / 795 mm) × (755 / 795 mm) |
| Base Size | 755 / 795 mm Square |
| Applications | Factories, Schools, Kitchens, Leisure |
📄 Manuals & Guides
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Systemair RAW Roof Cowl 400 / 450 Installation Manual
🚀 Why Choose the Systemair RAW 400 / 450 Roof Cowl?
If you’re searching for a large commercial roof ventilation cowl, GRP roof terminal for axial fans, or a weatherproof horizontal discharge roof vent, the RAW 400 / 450 delivers long-term reliability, installation flexibility, and proven Systemair engineering.
