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Fresh Air · Dehumidification · Water Coil

Fresh Air Dehumidifier
Water Coil Series

The InAir Water Coil Fresh Air Dehumidifier uses filtration, plate heat exchange and water cooling coil treatment. Outdoor fresh air or mixed return/fresh air is filtered, pre-cooled through a plate heat exchanger, dehumidified through a water coil and passed again through the exchanger for sensible heat recovery.

Model: INAD-CW30 / INAD-CW50 · Airflow: 300–500 CMH
InAir Fresh Air Dehumidifier Water Coil Series
✓30 mm foam board shell
✓G4 primary filter and H10 high-efficiency filter
✓Crossflow plate heat exchanger
✓50% sensible plate heat exchange efficiency
✓Built-in drain pan
✓EC fan with two adjustable speeds
✓Water cooling coils for dehumidification
✓Pressure difference gauge alarm or filter reminder option
✓Two air inlets and one air outlet
✓Wall-mounted installation only
✓Left-hand and right-hand type flexibility
Not sure which filtration grade suits your city?

Filter grade depends on local AQI and application. Ask our engineer — tell us your city and building type.

Best Applications

Typical applications

HomesVillasHumid climatesCoastal citiesMonsoon-sensitive spacesPremium bedroomsClinicsSpas and wellness areasOffices
How to Select — Step by Step
Check humidity load
Identify humidity target and latent load.
Confirm water coil availability
Ensure chilled water or suitable coil source is available.
Select CW30 or CW50
Match airflow and dehumidification capacity.
Plan drain and service access
Provide drain pan connection and access door clearance.
Validate left/right configuration
Select orientation based on duct route.
Frequently Asked Questions
INAD-CW30 is a 300 CMH unit, while INAD-CW50 is a 500 CMH unit with higher external pressure and dehumidification capacity.
Yes. The system uses water cooling coils for dehumidification.
It is a fresh air dehumidifier and should be selected based on ventilation and humidity load.
Ready to specify? Start with a free site survey.

How is Fresh Air Dehumidifier Water Coil Series 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?

The InAir Water Coil Fresh Air Dehumidifier uses filtration, plate heat exchange and water cooling coil treatment. Outdoor fresh air or mixed return/f. In practice that means homes, villas, humid climates, coastal cities. 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, 30 mm foam board shell. Second, g4 primary filter and h10 high-efficiency filter. Third, crossflow plate heat exchanger. 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 fresh air dehumidifier water coil series that usually means homes, villas, humid climates, coastal cities. 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 fresh air dehumidifier water coil series model delivers it, the filter grade your city calls for, and an installed cost. Typical duty for this range is homes, villas, humid climates, coastal cities. If the building already ventilates adequately, we say so rather than quoting.