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HEPA & Carbon Filtration

HEPA, Activated Carbon
& Filter Boxes

InAir filter boxes improve the quality of incoming or circulated air by combining pre-filtration, HEPA H13 filtration, and activated carbon filtration. Three-stage multi-layer filtration removes particles above 5 microns, fine PM2.5 and smoke, and gaseous pollutants including formaldehyde, odours, and VOCs. Filter boxes can be added to fresh air systems, ducted ventilation layouts, or standalone applications.

InAir HEPA, Activated Carbon & Filter Boxes
✓Pre-filter: removes particles above 5 microns — dust, pollen, hair
✓HEPA H13 filter: high-density filtration — 98%+ PM2.5 capture rate
✓Activated carbon filter: granular carbon removes odours, formaldehyde, VOCs
✓INAGLX-100: Φ100mm duct · 120–320 m³/h · 300×200×200mm casing
✓INAGLX-150: Φ150mm duct · 220–550 m³/h · 300×200×200mm casing
✓INAGLX-200: Φ200mm duct · 520–1500 m³/h · 430×300×300mm casing
✓INAGLX-250: Φ240mm duct · 1200–2600 m³/h · 430×300×300mm casing
✓Airflow reduction: 15–25% — factor into system design

Filter box range: INAGLX-100, INAGLX-150, INAGLX-200, INAGLX-250. HEPA H13 grade across all models. Airflow range: 120–2600 m³/h. Duct sizes Φ100–Φ240mm. 15–25% airflow reduction to be factored in design.

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Typical applications

Delhi / NCR AQI-SensitiveSchoolsPremium HomesClinics & WellnessOfficesUrban EnvironmentsFresh Air ERV Add-On

How is HEPA, Activated Carbon & Filter Boxes sized?

Sizing starts from the air the space actually needs, not from the size of the room. For occupied spaces that means airflow per person under ASHRAE 62.1 — CO2 is produced by people, so a crowded small room needs more air than an empty large one. For process and extract duties it means the required air changes per hour for the activity. Once the airflow is fixed, the duct route sets the static pressure the unit has to overcome, and those two numbers together select the model.

Three things change the answer in India specifically: outdoor temperature at the design peak, which decides how much heat recovery is worth paying for; outdoor humidity, which decides whether passive recovery is enough or active dehumidification is needed; and local AQI, which sets the filter grade — MERV-13 for ordinary urban particulate, HEPA-13 where AQI regularly passes 200. The city pages give the design figures for fifteen Indian cities.

Where does it install?

Installation is cheapest and least disruptive during construction or renovation, when ducting is concealed inside the ceiling void and no finished surface is disturbed. In a completed interior the same result is reached with surface-run ducting in a boxed soffit, or with a standalone unit that needs only a core-cut through an external wall. A typical residential installation is commissioned in ten to twelve days from order.

Every installation includes a site survey, duct design, commissioning with measured airflow readings, and handover. Send a floor plan to sales@in-air.in and we will size it and quote it.

What does it cost to run?

Two figures matter. The fan draws continuous power, which is small — residential units run in the tens of watts. The larger figure is what the unit saves: recovering heat from the air being exhausted means the incoming air arrives closer to room temperature, so the air conditioner does less work. In a Hyderabad summer, incoming air at 44°C reaching the room at 26–28°C is the difference between an AC that copes and one that runs continuously. Filters are the recurring cost, changed on a schedule that depends on local AQI.

Further reading

Product questions

What do specifiers ask about this range?

InAir filter boxes improve the quality of incoming or circulated air by combining pre-filtration, HEPA H13 filtration, and activated carbon filtration. In practice that means delhi / ncr aqi-sensitive, schools, premium homes, clinics & wellness. Selection starts from the duty the space needs rather than from the size of the room: airflow first, then the static pressure the duct route imposes, then filtration and controls. Get those three right and the equipment follows.
Three things. First, pre-filter: removes particles above 5 microns — dust, pollen, hair. Second, hepa h13 filter: high-density filtration — 98%+ pm2.5 capture rate. Third, activated carbon filter: granular carbon removes odours, formaldehyde, vocs. What matters is not the datasheet but that the specification is chosen for Indian operating conditions — sustained heat, monsoon humidity and a particulate load that shortens the life of equipment designed for a temperate climate.
Five steps, in order. Define the duty — for hepa, activated carbon & filter boxes that usually means delhi / ncr aqi-sensitive, schools, premium homes, clinics & wellness. Calculate the airflow from occupancy under ASHRAE 62.1 rather than from floor area. Check the static pressure the duct route imposes, which is what separates two units of the same rated airflow. Add the filter grade your city calls for. Then validate against the published performance curve.
Yes, and the survey costs nothing. Send a floor plan with occupancy and intended use to sales@in-air.in and an engineer returns the airflow the space needs, which hepa, activated carbon & filter boxes model delivers it, the filter grade your city calls for, and an installed cost. Typical duty for this range is delhi / ncr aqi-sensitive, schools, premium homes, clinics & wellness. If the building already ventilates adequately, we say so rather than quoting.