Kolkata · West Bengal

Fresh Air Ventilation in Kolkata

Tropical wet — extreme heat + extreme monsoon humidity + high AQI

InAir Fresh Air Ventilation in Kolkata
Summer temp
38–42°C
Humidity
80–95% RH (May–October)
AQI range
150–250
Filter grade
HEPA-13 (mandatory given AQI)

What makes ventilation difficult in Kolkata?

Kolkata combines extreme pre-monsoon heat (42°C in April–May) with sustained monsoon humidity AND one of India's more polluted AQI profiles. Dual challenge: latent load from humidity and particulate from industrial and biomass sources.

Which machine is right for Kolkata?

RHP Series + HEPA-13

Kolkata's consistently high AQI (150–250) combined with monsoon humidity (80–95% RH) demands dual action: RHP's active dehumidification removes moisture from every cubic metre of incoming air, while HEPA-13 captures PM2.5 from industrial and biomass sources. Standard ERV would transfer outdoor humidity indoors and lack the filtration grade this city requires.

For Kolkata we specify RHP Heat Pump ERV as the default, with HEPA-13 (mandatory given AQI) filtration. Models: RHP INA-RHP Series (preferred), Ventura ERV + HEPA-13 (large commercial alternative). Model-by-model airflow, static pressure and power figures are on the spec sheets.

Typically installed in: Apartments · Offices · Schools · Hospitals · Commercial spaces.
Also worth considering: Ventura ERV + HEPA-13 filter box for large commercial with separate HVAC dehumidification

How is a system sized here?

Sizing is driven by occupancy, not floor area — CO2 comes from people, so a small crowded flat needs more air than a large empty one. ASHRAE 62.1 sets the airflow per person; that number picks the unit. Kolkata then adds two local constraints: a summer peak of 38–42°C, which decides how much heat recovery is worth paying for, and humidity of 80–95% RH (May–October), which decides whether plain recovery is enough or whether active dehumidification is needed.

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Further reading

Kolkata questions

What do people in Kolkata ask?

Kolkata sees an AQI range of roughly 150–250 through the year. Kolkata combines extreme pre-monsoon heat (42°C in April–May) with sustained monsoon humidity AND one of India's more polluted AQI profiles. Dual challenge: latent load from humidity and particulate from industrial and biomass sources. That range is what sets the filter grade: we specify HEPA-13 (mandatory given AQI) here.
RHP Series + HEPA-13. We recommend the RHP heat-pump energy recovery unit for Kolkata. Kolkata's consistently high AQI (150–250) combined with monsoon humidity (80–95% RH) demands dual action: RHP's active dehumidification removes moisture from every cubic metre of incoming air, while HEPA-13 captures PM2.5 from industrial and biomass sources. Standard ERV would transfer outdoor humidity indoors and lack the filtration grade this city requires.
HEPA-13 (mandatory given AQI). Filter grade follows the local AQI rather than a national default — MERV-13 handles ordinary urban particulate, while HEPA-13 is warranted where AQI regularly passes 200 or where dust and industrial sources are present. In Kolkata the range is 150–250.
Yes. InAir supplies and installs across India from its Hyderabad base, and Kolkata in West Bengal is covered end to end — free site survey, duct design, supply, commissioning with measured airflow readings, and handover. A typical residential installation is commissioned ten to twelve days after order. Send a floor plan to sales@in-air.in and an engineer returns a sized proposal.
Sizing starts from occupancy rather than floor area, because CO₂ is produced by people. ASHRAE 62.1 gives the airflow per person; that figure sets the unit, and the Kolkata summer peak of 38–42°C plus humidity of 80–95% RH (May–October) decides whether plain heat recovery is enough or whether active dehumidification is required.