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Inline Duct Fans

KCVENTS inline duct fans are designed for supply, exhaust, transfer-air and equipment-cooling applications. Select the fan at the required airflow and external static pressure after accounting for duct length, bends, filters, grilles, terminals, sound and control needs.

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An inline duct fan should be selected at the required airflow and external static pressure, not by duct diameter alone. Map the duct route, fittings, grilles, filters and terminals first. Then choose the fan construction, speed control, sound treatment and service arrangement that fit the installed resistance and the intended application.

Quick answer

Use an EC mixed-flow model when adjustable speed and lower power are important, a galvanized inline series for longer duct routes, and a two-way model where one fan must serve two branches. The live product list shows the available series; the fan curve determines the final model.

EC stepless

EC mixed-flow construction with PWM speed adjustment for applications needing airflow tuning; the product page lists hydroponic grow-room, AV-closet and odor-extraction uses.

Galvanized inline

Metal inline fan path for concealed ductwork, longer air delivery and multiple duct sizes.

Two-way inline

A 1-to-2 air path for layouts that need distribution to two duct branches.

Representative model paths

Check the current product page and fan curve at the proposed duty point.

Product path Current page evidence Project question
EC Inline Fan With Stepless Speed Lists a mixed-flow impeller, EC motor and PWM speed regulation. What controllable airflow range is needed at the installed resistance?
In-Line Series Lists galvanized housing and centrifugal construction for concealed, longer duct routes. What static pressure is required after the full duct path is calculated?
DPT-M Silent Duct Fan Listed as a slim-box centrifugal duct-fan product path. Does the ceiling or service space require a compact box format?

Specification basis: use the linked KCVENTS product pages as the starting point, then confirm airflow at external static pressure, sound data, electrical characteristics, mounting and the latest datasheet before purchase.

"ISO 5801:2017 specifies procedures for the determination of the performance of fans of all types except those designed solely for air circulation, e.g. ceiling fans and table fans."

ISO 5801:2017 is a fan performance test method, not a certification scheme; confirm the actual test report and revision for the exact model. The European Union estimates that, without fan-efficiency regulation, fans would have used 336 TWh of electricity in 2020 and could reach 384 TWh in 2030. This is a category-level policy statistic, not a promise about one inline fan. See the EU source.

Inline duct fan buying questions

Use these questions to turn a nominal airflow need into a usable fan selection.

Why is external static pressure necessary?

Every bend, duct length, grille, filter and terminal adds resistance. The fan curve shows whether the selected model can still deliver the design airflow at that resistance.

Can a larger duct fan solve every airflow problem?

No. Oversizing can create excess noise, poor control and unnecessary energy use. Select from a defined duty point, then review controllability and acoustic treatment.

When is speed control useful?

Speed control can help match airflow to changing conditions, commissioning and noise targets. Check controller compatibility and the permitted operating range for the exact model.

What should an inline-fan RFQ include?

Provide airflow, estimated external static pressure, duct diameter and layout, application, noise target, voltage, control requirement, installation constraints, quantity and target market.

Need a model recommendation?

Send the application, required airflow, wall construction, target market, voltage or plug requirement, certification needs and estimated quantity.

KCVENTS can then confirm the suitable model variant, available controls and the documentation required for your project.
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