Colt 3UL - weather louvre for maximum rain defence
A roll-formed Triple Bank Louvre System designed for applications requiring ventilation with the maximum degree of rain defence.
For applications where rain defence is not the primary focus, see 1UL (all-round performance), 2UL (plant room and screening) or ESC (screening and cladding). Colt can advise on the appropriate product for your specific needs, contact us for more details.
3UL design, manufacture and configuration
Colt 3UL Universal Louvre is a roll-formed or extruded triple (3UL) bank system, used for screening and/or ventilation. 3UL is designed for use where rain defence is of the utmost importance.
Colt louvre systems can be uniquely configured to provide the solution to your needs. Software programs are freely available to assist with this. It’s easy to size a panel according to a maximum pressure drop, or to specify the appropriate louvre bank configuration based on a set flow rate and maximum pressure drop. Please contact Colt for assistance.
Louvres can be extruded or roll-formed; either mill finish, polyester powder painted, pre-coated or anodised; perforated or stucco embossed. Louvre panels can incorporate mitred corners, special shapes and louvre doors. Colt also has a range of turret unitsIf noise reduction is required, acoustic louvre panels may be used.
Features and benefits overview
Enhanced rain defence with high resistance to rain ingress. The unique design ensures that rain is collected and transferred effectively.
High aerodynamic efficiency – this reduces air resistance, allowing the plant and the aperture to be minimised thereby saving running costs.
Durable and maintenance free – UL is completely made from corrosion resistant materials.
Louvres are clipped and not riveted or screwed to structural supporting mullions - this allows for thermal expansion of the louvres.
Proven performance - UL has been tested to EN 13030:2001.
Easy to install – UL can either be delivered to site pre-assembled or as a kit of parts.
How it works:
Diagram on How 3UL Works
- Air and rain enters between the louvre blades.
- Water is transferred to the second louvre where it is collected.
- Water is transferred along the blades and into the hollow vertical mullion thus preventing re-entrainment, draining the collected water onto the cill.
3UL Diagram
Options
There are two front louvre profiles:
- Shallow (50mm pitch)
- Deep (100mm pitch)
The rear louvre always remains at 50mm pitch.
There are two arrangements:
Both arrangements can also be inverted.
There are three options for the principal components:
- Aluminium
- Galvanised Mild Steel
- Stainless Steel
Perforated, stucco and pre-coated materials are also available and can be used to singular effect (subject to material specification and quantity). Normally applied to the front blades and frames only.
There are many decorative finish options, including:
- Mill Finish (aluminium)
- Stoved Polyester Powder Paint
- Anodised (aluminium)
The applied finishes can be supplied in two coverage levels:
- Total (all principal components)
- Partial (front louvres and frames only).
There are a large selection of optional accessories such as:
- Mitred Corners
- Blanking Panels
- Special Shapes
- Acoustic Modules
- Guards (bird/ insect*/ security)
- Doors
- Turrets
* With Insect Mesh, the design should allow for additional resistance to airflow and reduced flow rate performance.
3UL Plan
Performance specification
The louvre system achieves minimum performance coefficients (Cv) of 0.277 (inlet) and 0.22 (extract). These have been established as the result of full-scale wind tunnel tests.
The louvre system achieves the following weathering classification when tested against the EN 13030: 2001 standard (method of test for water rejection performance of louvres subjected to simulated rainfall):
Class A3 - up to 3.5m/s suction velocity.
For more details download the leaflet.
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