Gravity Louvre Ventilation ABS Plastic 501x501mm Ø450mm UV Resistant GSP 450, Harmann

Quick Facts – Harmann GSP 450 Gravity Louvre

• Brand: Harmann
• Model: GSP 450
• Type: Gravity louvre for ventilation exhaust
• Material: ABS plastic (UV resistant)
• Overall dimensions (A): 501 × 501 mm
• Mounting diameter: Ø 450 mm
• Depth (B): 31 mm
• Inner dimension (C): 395 mm
• Mounting aperture (D): 460 mm
• Mounting: Wall, horizontal
• Function: Backflow prevention (non-return valve principle)

The Harmann GSP 450 is a gravity louvre designed for wall mounting at the outlet of ventilation systems. The blades open under the pressure of the airflow when the ventilation is running and close by gravity when the airflow stops, acting as a non-return valve. This prevents backflow in the ventilation installation, reduces heat losses and protects the ventilation duct against wind, rain, snow and hail.

The louvre is manufactured from ABS plastic, a durable thermoplastic material that combines three properties: acrylonitrile provides chemical resistance and heat stability, butadiene provides toughness and high impact strength, and styrene provides rigidity. The material is UV resistant, which is important for components exposed to direct sunlight in outdoor installations. The overall dimension is 501 × 501 mm, the mounting diameter Ø 450 mm and the depth 31 mm.

The louvre is designed for horizontal mounting. The opening angle of the blades depends on the ventilation system's airflow – at lower flows the blades do not open fully. Incomplete opening is not a fault in the louvre but an indicator of limited airflow in the system.

What is the Harmann GSP 450 gravity louvre and why should you choose it?

The Harmann GSP 450 is a passive gravity louvre that operates without any electrical connection or control. The blades open automatically with the airflow from the ventilation and close by their own weight when the flow ceases. This simple mechanical system is quiet in operation and requires no maintenance beyond cleaning. The ABS plastic is lightweight, chemically resistant and withstands UV exposure without becoming brittle. The louvre acts as a non-return valve that both reduces heat losses and protects against weather. The standard Ø 450 mm size makes it compatible with common ventilation ducts and wall penetrations.

What environments is the Harmann GSP 450 gravity louvre suited to?

The louvre suits wall mounting on residential buildings, offices, warehouses, industrial premises and agricultural buildings at exhaust openings from kitchens, bathrooms, ventilation systems, industrial exhaust ducts and similar installations with a Ø 450 mm connection. The ABS plastic withstands outdoor exposure with direct sunlight, rain and temperature variations. The louvre functions in both dry and humid environments and is easy to clean with water and mild detergent.

Technical Specifications

Suitable for: HVAC installers, property managers, builders, homeowners and ventilation contractors who need passive backflow prevention for exhaust openings.

Industries: HVAC installation, property management, house building, renovation and ventilation contracting.

Frequently Asked Questions (FAQ)

Does the Harmann GSP 450 gravity louvre function as a non-return valve on kitchen or bathroom ventilation exhausts?

Yes, the Harmann GSP 450 gravity louvre functions as a passive non-return valve. The blades open under the pressure of the airflow when the ventilation is running and close by gravity when the flow stops. This prevents backflow in the duct, reduces heat losses and protects against wind, rain and snow from outside. The louvre is designed for horizontal wall mounting with a Ø 450 mm connection.

What dimensions does the Harmann GSP 450 gravity louvre have and which ventilation duct does it fit?

The Harmann GSP 450 has overall dimensions of 501 × 501 mm with a mounting diameter of Ø 450 mm. The depth is 31 mm, the inner dimension 395 mm and the mounting aperture 460 mm. The louvre fits ventilation ducts with a nominal diameter of 450 mm. It is manufactured from UV-resistant ABS plastic and suits outdoor mounting on building exterior walls.

What sets the Harmann GSP 450 gravity louvre apart from electric louvres and aluminium louvres on Verktygsgrossen?

The Harmann GSP 450 is a passive gravity louvre that operates without electricity, control signals or a motor – the blades open with airflow and close by gravity. This simplifies installation and requires no maintenance beyond cleaning. The ABS plastic is lightweight (the louvre weighs considerably less than an aluminium louvre), chemically resistant and UV resistant. The round mounting diameter of Ø 450 mm is designed for standard ventilation ducts, unlike square louvres for wall-mounted fans. The louvre only works when mounted horizontally.