Delhi NCR · Delhi

Fresh Air Ventilation in Delhi NCR

Composite — extreme heat, cold winters, very high pollution

InAir Fresh Air Ventilation in Delhi NCR
Summer temp
42–46°C
Humidity
30–40% RH summer / 60–80% monsoon
AQI range
200–500
Filter grade
HEPA-13 (mandatory)

What makes ventilation difficult in Delhi NCR?

Delhi presents India's most demanding IAQ challenge: AQI regularly crosses 400 in October–February, summer temperatures touch 46°C, and winter nights drop to 2–5°C. Standard MERV-13 filtration is completely inadequate — HEPA-13 is the minimum viable filter grade.

Which machine is right for Delhi NCR?

RHP + HEPA-13 (Premium) · Revita ERV + HEPA-13 (Standard)

HEPA-13 captures 99.97% of PM2.5 — non-negotiable for Delhi. Premium: RHP provides active cooling (46°C summers) and heat recovery (2°C winters) with year-round HEPA-13 filtration. Standard: Revita ERV + HEPA-13 filter box delivers clean air at lower cost. Both options are infinitely better than no ventilation.

For Delhi NCR we specify Revita ERV or RHP Heat Pump as the default, with HEPA-13 (mandatory) filtration. Models: RHP INA-RHP Series (premium) OR Revita INA-MFQR + HEPA-13 filter box. Model-by-model airflow, static pressure and power figures are on the spec sheets.

Typically installed in: All homes (HEPA-13 essential) · Schools · Hospitals · Offices.
Also worth considering: INA-GLX HEPA filter box upgrades any existing ventilation system to HEPA-13 grade

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. Delhi NCR then adds two local constraints: a summer peak of 42–46°C, which decides how much heat recovery is worth paying for, and humidity of 30–40% RH summer / 60–80% monsoon, which decides whether plain recovery is enough or whether active dehumidification is needed.

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Further reading

Delhi NCR questions

What do people in Delhi NCR ask?

Delhi NCR sees an AQI range of roughly 200–500 through the year. Delhi presents India's most demanding IAQ challenge: AQI regularly crosses 400 in October–February, summer temperatures touch 46°C, and winter nights drop to 2–5°C. Standard MERV-13 filtration is completely inadequate — HEPA-13 is the minimum viable filter grade. That range is what sets the filter grade: we specify HEPA-13 (mandatory) here.
RHP + HEPA-13 (Premium) · Revita ERV + HEPA-13 (Standard). We recommend either the Revita ERV or the RHP heat-pump unit for Delhi NCR. HEPA-13 captures 99.97% of PM2.5 — non-negotiable for Delhi. Premium: RHP provides active cooling (46°C summers) and heat recovery (2°C winters) with year-round HEPA-13 filtration. Standard: Revita ERV + HEPA-13 filter box delivers clean air at lower cost. Both options are infinitely better than no ventilation.
HEPA-13 (mandatory). 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 Delhi NCR the range is 200–500.
Yes. InAir supplies and installs across India from its Hyderabad base, and Delhi NCR in Delhi 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 Delhi NCR summer peak of 42–46°C plus humidity of 30–40% RH summer / 60–80% monsoon decides whether plain heat recovery is enough or whether active dehumidification is required.