We manufacture two types of dampers at MK Plastics: control dampers and automatic gravity dampers. Here's what you need to know about the functionality and usefulness of the dampers we offer.
Control dampers are used in buildings to regulate airflow in HVAC systems. They can be used in intake exhaust, or mixed air applications. The most common type of control damper is called a manual balancing damper. They regulate the flow of air but are not generally intended to be used in applications for positive shutoff. They usually come with a manual quadrant lock so once the system is balanced, it's set into place.
Another type is the industrial/commercial control damper. It regulates the flow of air in the same manners a balancing damper, but with the addition that it can be used for either positive shutoff or automatic control. These dampers have extended shafts and you can add a small electronic motor control actuator or a pneumatic actuator (which you don't see as often). As with the balancing damper, you can use a manual quadrant lock.
Gravity Backdraft Dampers
Sometimes called an automatic damper, gravity backdraft dampers are similar to control dampers in appearance and build. However, the air velocity that goes through it opens up the blade. When it's not in use, there's no air velocity and gravity closes the dampers shut. It's a simple, basic shutoff damper that can be used in many different variations of an HVAC system. We use it on our fans as a simple on/off system, but it can be used in other applications as well.
Fixing Existing Systems
We specialize in corrosion resistant products. If an application involves corrosive fumes and the existing damper is corroded, seized up, or just rotting away, there are a few options. Customers might choose a stainless steel damper, which is very expensive. A more economical alternative would be a fiberglass damper. We're sure to ask about the application and the intended use, size, etc. so we can select the type of damper that would fit the need for that particular application.
We have round control dampers to suit round duct applications. We also have square/rectangular fans in various different sizes. There are single blade, single width sizes up to 3 feet in width for multiple section dampers. If you need one that's 12 feet, 20 feet, or any other size, we can accommodate and design it to suit your need.
Our products are available anywhere in the world, and we can supply the control mechanism to go with the damper. They come with optional seals, and some dampers come with standard seals on the blades and jams to prevent leakages. We have high pressure dampers that are suitable all the way up to 30 inches of negative pressure. Some of our models are even AMCA certified for airflow and air leakage.
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Ken: We're here with Simon Davies of MK Plastics and today Simon is going to explain to us the functionality of dampers in his world.
Simon: So there are basically two types of dampers out there that we manufacture and it's generally same in the industry and that is control and automatic gravity dampers and we manufacture and sell both. The first, control dampers, are used in buildings to regulate flow or air in HVAC systems and they can be used in intake, exhaust, or mixed air applications. The most basic common type is what's called a manual balancing damper and they are control dampers that regulate the flow of air but are not generally intended to be used for applications for positive shutoff. They usually come with a lock, a manual quadrant lock as we call it so once the system is balanced, then it's just set in place. The other type in the control section is your industrial or commercial control damper which regulates the flow of air in the same manner as a balancing damper but with the addition that it can be used for either positive shutoff or for automatic control. These have extended shafts and you can add an electronic, it's like a little motor control actuator on it or a pneumatic actuator. You don't see them so often. Or again, you can just use a manual quadrant lock so they're the two types of control. The other one that I mentioned, the second one, is a gravity backdraft damper and sometimes called an automatic damper and essentially it's similar to a control damper in the way it looks and the way it's built except that air velocity goes through it and that velocity opens up the blade and then when it's not in use, there's no air velocity, gravity shuts the dampers shut and that's a simple basic shutoff damper that can be used in many different variations of the HVAC system. We use it on our fans as a simple on/off system but it can be used in other applications also.
Ken: Now if I believe that I have a need for a damper system and at one point, let's say we're doing a retrofit.
Ken: How do we fix what the other guy did or what time has taken its toll on by calling MK Plastics?
Simon: Well, we specialize in corrosion resistant products so generally speaking, if somebody calls and say they require a damper, it's because there is corrosion in the fumes so the existing damper that they have is probably corroded or seized or just rotting away and the application that they require could either want a stainless steel damper which is very very expensive, or a more economical alternative would be a fiberglass damper so we would ask about the application and what its intended uses for the size so on and so forth and we would size and select a type of damper that would fit the need for that particular application.
Ken: So all they need to go is wander over to MKPlastics.com or call you guys at (514) 871-9999?
Simon: That is correct and on our website, as with all our products, we have catalogs and literature on our dampers. We have round control dampers to suit round duct applications or fans, square rectangular. The come in different sizes. Some single blade, single width sizes up to three foot in width for multiple section dampers. So if you need one that's, say, 12 foot, 20 foot, any size that you want, we can accommodate that and we can design it to suit the need.
Ken: So any size anywhere in the world.
Simon: Anywhere in the world and we can supply the control mechanism to go with that damper. They come with optional seals and some dampers seals are standard on the blades and jams and that is there to prevent leakage. We go up to high pressure dampers that are suitable all the way up to 30 inches of negative pressure and some of our models are even AMCA certified for airflow and air leakage.
Ken: That gives us a quick overview of what MK Plastics can bring to us in the world of dampers in a corrosive environment and Simon, 'til next time.
Simon: Thank you very much.