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KBG Group
KBG GroupPROJECT STUDY
Bangalore Metro · BMRCL

Under execution

EN 13030 ventilation louvers for underground Bangalore Metro

NABL-tested aluminium extruded louvers on the supply and exhaust ventilation shafts of six underground BMRCL stations — certified to EN 13030 with Class A water penetration.

Underground metro ventilation with louvered supply and exhaust shafts Schematic cross-section: a louvered supply shaft draws fresh air down to an underground station while a louvered exhaust shaft discharges vitiated air upward. Street-level louvers reject rain. Airflow directions are indicative, not measured. Street level Underground station / running tunnel Supply shaft Fresh air in Exhaust shaft Vitiated air out
How KBG's louvers are used: they cap the street-level supply and exhaust shafts that ventilate the underground station — passing air while rejecting rain. Schematic, not to scale.
Client
BMRCL — Bangalore Metro Rail Corporation Ltd
Application
Underground station ventilation shafts
Scope
Six underground stations · supply & exhaust
Product
Aluminium extruded louvers

Project under execution. Station-level completion and client-acceptance records are confirmed as the rollout progresses. Airflow directions in diagrams are indicative and not a substitute for project ventilation calculations.

Project at a glance

Client
BMRCLBangalore Metro Rail Corp.
Location
BengaluruUnderground metro corridor
Scope
Six underground stationsSupply & exhaust shafts
Application
Shaft ventilationFresh-air supply & exhaust
Product
Aluminium extruded louversPrecision blade profiles
Testing
NABL-accredited labIndependent test
Standard
EN 13030 · Class AWater penetration
Status
Under executionPhased station rollout

The requirement

Underground metro stations rely on mechanical ventilation shafts that reach street level. Their openings must move large volumes of supply and exhaust air while keeping rain and weather out of the shaft — in the middle of a dense urban environment.

KBG's scope

KBG supplies aluminium extruded ventilation louvers for the supply and exhaust shafts across six underground stations. The louvers are tested at a NABL-accredited laboratory and certified to EN 13030, achieving Class A water-penetration effectiveness.

Delivered work

  • Supply-shaft louvers
  • Exhaust-shaft louvers
  • Extruded aluminium sections
  • Six-station rollout

Two jobs, one louver: pass air, reject rain

Each shaft opening has to do two opposing things at once — let ventilation air through freely, and stop rain from entering the shaft. The louver blade geometry is what makes both possible.

How a weather louver passes air while rejecting rain Angled blades let a horizontal airflow pass through the gaps toward the shaft, while wind-driven rain strikes the blade faces and drains down the outer side. Directions are indicative. Outside (weather) Shaft side Wind-driven rain Rain drains out Airflow through blades
Weather-louver principle. Blade angle and spacing set the balance between free area (airflow) and water rejection — the properties EN 13030 measures.
Supply Fresh air → station
Supply shaft — fresh air drawn down to the platform.
Exhaust Vitiated air → out
Exhaust shaft — vitiated / smoke-extract air discharged to street level.

Independently tested. Certified to EN 13030.

Rather than a claimed rating, the louvers were tested at a NABL-accredited laboratory to EN 13030 — the European standard for the weather performance of building louvres — so consultants can specify against a verified result.

EN 13030 test outcome

Aluminium extruded ventilation louver · NABL-accredited laboratory

Water penetration

Class A

ABCD

EN 13030 effectiveness scale — Class A is the highest.

Air & pressure performance

Verified

Pressure drop calculated

Airflow and pressure-loss behaviour established under the same EN 13030 test, for shaft sizing.

Test standard & authority

EN 13030

NABL-accredited lab

Independent laboratory testing — result available for specification and submittals.

EN 13030 rates a louvre's resistance to water penetration (Class A–D) and its air/pressure performance under controlled rain and airflow. Class A denotes the highest water-rejection effectiveness at the rated velocity.

Why aluminium extruded louvers for metro shafts

A six-station rollout

The same tested louver system is deployed across the supply and exhaust shafts of six underground stations, with installation phased station by station.

Station 1Supply + exhaust Station 2Supply + exhaust Station 3Supply + exhaust Station 4Supply + exhaust Station 5Supply + exhaust Station 6Supply + exhaust Underground corridor
Indicative corridor schematic — six underground stations, each fitted with supply and exhaust shaft louvers. Not a route map; station names not shown.
  1. 1

    Design & sizing

    Per shaft opening

    Louver sizes set to the supply and exhaust shaft openings and airflow requirements.

  2. 2

    Testing & certification

    NABL · EN 13030

    Independent laboratory test; Class A water penetration certified.

  3. 3

    Manufacturing

    Extruded aluminium

    Louver sections extruded and fabricated to each station's openings.

  4. 4

    Installation

    Six stations · in progress

    Supply and exhaust shaft louvers installed, phased station by station.

Site photo slot — installed shaft louvers at a station
Reserved for site photography — drop a .webp into assets/images/projects/bangalore/.
Site photo slot — louver detail / EN 13030 test setup
Reserved for product or test photography under the same filename convention.

Specifying louvers for a metro or underground project?

Discuss shaft ventilation, EN 13030 weather performance and NABL-tested louvers with KBG.

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