Louver Dampers

Kelair Louver dampers modulate and isolate the flow of air or gas in a system

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Kelair Dampers Brochure

Industrial Dampers that feature quick actuation, control and isolation

Kelair Louver Dampers or Multi-Vane Louver Dampers consist of several blades mounted parallel across a duct. They modulate the flow of air and gas in dry or wet conditions or can isolate and shut them off altogether. Opposing blade type louvers allow the flow to increase or decrease. Parallel blades allow for complete shut off and are particularly useful where space is restricted.

These dampers are frequently motorized or can be manually adjusted for flow control.  Louver dampers control gas or air flow, detour flow into separate systems, or isolate a process for inspection and maintenance.  They are particularly useful in applications where quick actuation and space constraints are major issues.  Louver dampers are adaptable, can be lightweight, compact and have low leakage to the outside environment. 

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

Louver Damper Manufacturing

Product Features & Specifications

  • Sizes: 14″ to 132″
  • Process Temperature: up to 1100° F
  • Configurations: round, square, & rectangular (parallel or opposed vane)
  • Construction: S.S. or painted C.S. (others available upon request)
  • Shutoff: up to 99%
  • Seal Options: compression, jamb, metal seat, swing-thru; control & balancing
  • Actuation: manual, electric, pneumatic (spring return and failsafe available)
  • Modulation: open/closed or modulating
  • Pressure: up to 1-PSI & 4000 FPM process air (higher available upon request)
  • Ball bearings and shaft packing glands standard 
Kelair Louver Damper

Commonly Asked Questions About Louver Dampers

What types of seals can be used on a louver damper?

The most common types of seals used within louver dampers include compression seals, metal seals, and jam seals. Jam seals, in particular, allow for thermal growth of the blade(s) and can minimize the accumulation of fly ash.

What kinds of applications are louver dampers ideal for?

Kelair louver dampers can be made to withstand temperatures greater than 1800°F (with our in-house refractory) and pressures up to 1 PSI, making them ideal for industrial applications. Louver dampers can be used for fast power generation, metal tempering systems, fan inlets, and much more.

How often should packing glands be changed out?

The packing gland is a type of stuffing used to seal the rotating shaft, creating a barrier between process and exterior environment. While relatively inexpensive, damage to the packing gland can result in expensive damage such as binding and/or warped blades. Packing glands should be replaced at least every 5 years (depending on the process). For more information on louver damper maintenance, check out our Maintenance Checklists.

What can cause linkages to operate ineffectively on louver dampers?

Linkages connect all shafts to the actuator, allowing the damper to open/close simultaneously. Over long periods of time, linkages may become offset or even warp, causing blades to operate effectively. Regular maintenance can help ensure that linkages continue to work properly without warping.