Frequently Asked Questions

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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.

How are bearings inspected on the diverter and tee dampers?
Bearings are inspected on the diverter and tee dampers via visual inspection. Make sure to visually inspect the bearings both prior to running and while running to ensure that all shafts are rotating correctly,with minimal friction, and within the specified actuation time.
What is the recommended inspection frequency for the shaft of diverter dampers?
Since the shaft plays such a large part in a damper’s operation, inspections are recommended on an annual basis, at minimum. During inspection of the shaft, make sure to check that the shaft is straight and operating smoothly.
What are some of the most common applications for diverter and tee dampers?
Diverter and tee dampers can be used in a diverse range of industrial applications, such as: air pollution control systems, heat recovery systems, within cogeneration units for waste heat recovery boilers, or anywhere you’d like to divert air or gas flow from one outlet to another.
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 %)
What is the warranty on a Kelair Damper?

Standard warranty on a Kelair damper covers replacement of defective equipment, excluding labor, for 1 year from installation or 18 months from ship date from Kelair, whichever comes first.

What are the benefits of a butterfly damper?

Compact design, most economical, no exterior linkage, higher shutoff rates and butterfly dampers remain consistent along temperature swings.

What are the benefits of a louver damper?

Compact interior vane design (open vanes do not extend into adjoining duct as much as butterfly dampers).  Best suited for modulation flow control with opposed vanes.

Does Kelair manufacture galvanized or aluminum dampers?

These types of materials are more commonly used in HVAC applications.  Kelair manufactures stainless steel and carbon steel industrial dampers.

Does Kelair manufacture zero leak dampers?

The maximum shutoff we provide is 99% at 5" WC.  Contact us to determine if you must have 100% shut off.

What types of seals are used on a butterfly damper?

The most common types of seals used within butterfly dampers include tadpole seals (which provide better compression; ideal for uneven services) and metal seats.

How are shafts used on butterfly dampers?

The butterfly damper's shaft plays a large part in its operation, as it intersects the linkage, bearing, packing, and blade. When inspecting the shaft, make sure to check that it is straight and operating smoothly.

What does proper care look like for the butterfly damper blades?

Depending on the damper's environment, process, and age, blades can warp or bend over time. Proper care involves regularly checking the blade to ensure there is no warping or twisting, or buildup of debris that could prevent the blade from performing correctly.

Do butterfly dampers require any maintenance?

Although Kelair dampers require minimal maintenance, there are aftermarket parts of the butterfly damper that should be kept in stock and checked regularly. For more information on maintenance, check out our Maintenance Checklists.

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.

Can we supply our own Actuator?

Yes, Kelair can supply an operator mount and coupling for customer supplied actuator.

What are your standard lead times?

Standard lead times are 4-5 weeks after approved prints.

3-4 weeks with expediting

2-3 weeks without actuators

Is expediting an option?

Yes, with actuators 3-4 weeks

Without actuators 2-3 weeks

Can you custom design a damper for me?

Yes, please email us at: or phone us: 800.369.1070

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Our Manufacturer Sales Representatives across the country or our factory sales personnel will be pleased to discuss your specific application and available options with you.

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