What you Need to Know before Specifying Weather Louvres

 

Weather louvres, aka. performance Louvre or stormproof louvre, is designed to protect against the onslaught of wind-driven rain, whilst allow the passage of air into the room. A weather louvre does not have any moving parts, and is designed to work as efficiently as possible at letting air through whilst keeping water out. Whether the right weather louvres are specified for a particular project or application should determine how effectively they perform their function.

 

Airflow

When selecting weather louvres, one of the most important aspects is the air velocity at the louvre face.

This can be calculated using the following formula:

Face Velocity (m/s) = Volume Flow Rate (m³/s) / Face Area (m²)

Specifying a louvre system is a compromise between air flow and water ingress. Poor specification can lead to rainwater ingress, not enough ventilation, wasted energy and poor performance, not only of the equipment being ventilated, but that of the building as a whole.

 

Water penetration

Water penetration refers to the ability to prevent rain penetrating the louvre, which is classified into 4 grades according to the BS EN 13030:2001 water penetration banding.

Class	Maximum allowable penetration of rain l/h. m²
A	0.75
B	3.75
C	15
D	Greater than 15

 

Key considerations for working out your water penetration requirements are:

• The degree of allowable water penetration (0% - 100%)

• The severity of local/site weather conditions

• The position of the louvre on the building (sheltered from the weather or exposed?)

 

Achieving Balance

Ultimately, everyone wants 100% rain defense and 100% air flow. However, this is not always achievable and there is a compromise between these two performance factors.

To specify your right weather louvres, all factors should then be balanced with the required airflow, the maximum acceptable pressure drop, the degree and depth of acceptable water penetration and, finally, the building’s exterior design, which can dictate where louvres can be placed and how they fit into the aesthetics.

 

For more information, welcome to contact Togen Building Products. We are always ready to offer you constructive advice and good products.

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