Inlet Vane Dampers

Kelair’s Inlet Vane Dampers work with fans and blowers to enhance their performance by controlling air volume and fan shut-off.

Download our Brochure

Kelair Dampers Brochure

Engineered for Easy Maintenance and Service

The Inlet Vane Damper is an ideal way to improve performance and efficiency within industrial applications. Vane dampers (also known as Variable Inlet Vane Damper (VIV), Inlet Vane Control Damper (IVC), Radial Vane Damper, and Vortex damper among others) perform the same basic function: they pre-spin air, in the same direction as the fan rotation, before it enters the fan inlet. This directed air reduces the load on the fan by lowering the fan pressure. This in turn reduces the energy necessary to operate the fan. Inlet vane dampers reduce the energy costs necessary to operate fans, enhance their performance, extend fan life, and provide long term savings.


Kelair’s Inlet Vane dampers have a central hub surrounded by multiple blades and are used primarily in clean air/gas environments without particulates. Inlet dampers are appropriate for both volume control and fan shutoff. This damper has the added benefit of easily allowing field changeable air pre-spin rotation. Designed and engineered for easy maintenance and service, there is no need to remove the Kelair Inlet Vane damper from the fan as it is built to take high airflow velocities.

*Operational testing and calibrating are completed at the factory prior to installation.


Split Panel Inlet Vane Damper from Kelair

Product Specifications & Features

  • Sizes: 12″ to 96″
  • Process Temperature: up to 1100° F
  • Configurations: round
  • Construction: stainless steel or carbon steel (other materials available upon request)
  • Shutoff: up to 90%
  • Actuation: manual, electric, & pneumatic (failsafe available)
  • Modulation: open/close or modulating
  • Pressure: up to 1 PSI & 4000 FPM process air (higher available upon request)

Frequently Asked Questions

What are examples of typical inlet vane damper applications?
Inlet vane dampers are often used in facilities that have complete control of their ventilation systems. These types of ventilation systems include flue gas, automotive, and oven recirculation systems.
What does proper care look like for an inlet vane damper?

Depending on the inlet vane damper's environment and age, blades can warp or bend over time. Proper care involves regularly checking each blade to ensure there is no warping, twisting, or buildup of debris that could prevent the blade from performing correctly. Ideally, blade inspections should occur annually or during every outage, whichever comes first.

What is the minimum information I need to get a quote on a damper?

For the most accurate quote please provide the following information:

  • Type or style of damper. For example: butterfly, louver, Tee, diverter, etc.
  • Preferred material, such as stainless steel, carbon steel, other
  • Pressure requirement
  • Temperature the damper will be exposed to
  • Air flow amount
  • Manual, pneumatic or electric actuation/positioner required
  • Amount of shut off needed (usually in %)