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Inline, Duct & Silent Fans

Inline, Duct &
Silent Ventilation Fans

InAir inline and duct fans are compact, efficient air movement solutions for ducted ventilation, exhaust, air transfer, booster airflow, and silent indoor ventilation. The range includes purified duct fans, two-way ventilation duct fans, and inline air conditioner fans — each suited to specific duct layouts, airflow requirements, and installation conditions.

InAir Inline, Duct & Silent Ventilation Fans
✓Compact duct-mounted design — fits inside standard duct routes and ceiling voids
✓Low-noise operation — suitable for occupied bedrooms, offices and schools
✓Supply and exhaust configurations available
✓Multiple airflow capacities: 120 m³/h to 920 m³/h
✓Energy-saving motor options for reduced operating cost
✓Filter system option on purified duct fan models
✓Noise ratings from 21 dB(A) to 45 dB(A) depending on model and speed
✓Forward-inclined double suction impellers on inline AC fan models for high volume and low noise

Model airflows: 120–920 m³/h. Noise: 21–45 dB. Static pressure up to 382 Pa. Contact us for model-specific technical datasheets and selection support.

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Typical applications

HomesOfficesRestaurantsKitchensSchoolsWarehousesDucted Ventilation Systems

How is Inline, Duct & Silent Ventilation Fans 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 inline and duct fans are compact, efficient air movement solutions for ducted ventilation, exhaust, air transfer, booster airflow, and silent in. In practice that means homes, offices, restaurants, kitchens. 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, compact duct-mounted design — fits inside standard duct routes and ceiling voids. Second, low-noise operation — suitable for occupied bedrooms, offices and schools. Third, supply and exhaust configurations available. 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 inline, duct & silent ventilation fans that usually means homes, offices, restaurants, kitchens. 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 inline, duct & silent ventilation fans model delivers it, the filter grade your city calls for, and an installed cost. Typical duty for this range is homes, offices, restaurants, kitchens. If the building already ventilates adequately, we say so rather than quoting.