[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"globals_businessInfo":3,"blogPost_tunnel-dampers-and-the-piston-effect_entry":28,"get_announcements":88,"blogPost_tunnel-dampers-and-the-piston-effect_relatedPostsEntries":153,"theHeader_mainMenu":197,"theHeader_topMenu":240,"theHeader_siteTopBarCta":250},{"__typename":4,"businessInformation":5,"businessLinks":15},"businessInformationAndLink_Entry",[6],{"__typename":7,"typeHandle":8,"companyName":9,"address":10,"city":11,"zip":12,"state":13,"phone":14},"address_Entry","address","AWV","219 S. Church Street","Bowling Green","43402","OH","+1 419 865-5000",[16,22],{"__typename":17,"typeHandle":18,"twitterUrl":19,"linkedinUrl":20,"facebookUrl":21},"socialLinks_Entry","socialLinks",null,"https:\u002F\u002Fwww.linkedin.com\u002Fcompany\u002Famerican-warming-&-ventilating-a-mestek-company","https:\u002F\u002Fwww.facebook.com\u002FAWV.USA\u002F?ref=br_rs",{"__typename":23,"typeHandle":24,"termsOfUseLink":25,"termsAndConditionsLink":26,"portalLink":27},"termsLinks_Entry","termsLinks","https:\u002F\u002Fwww.mestek.com\u002FHome\u002FLegal","https:\u002F\u002Fwww.literature.mestek.com\u002Fdms\u002FAmericanWarmingVentilating\u002Ftc-2010-A(3)-2-25-10.pdf","https:\u002F\u002Fwww.salesassistant.com\u002F",{"__typename":29,"id":30,"title":31,"seoTitle":31,"seoDescription":32,"blogPostBodyContent":33,"blogPostFeaturedImage":34,"blogPostSidebarCta":38,"blogPostTags":60,"blogPostBannerImage":78,"blogPostBottomCta":81,"seomatic":82},"blogPost_Entry","10370","Tunnel Dampers and the Piston Effect","Tunnel dampers are volume control dampers that are built to withstand the intense conditions of tunnel air flow. They can also help alleviate air flow issues caused by the piston effect.","\u003Cp>Transit tunnels are the lifeline of major cities. Whether they carry traffic or trains, these tunnels need adequate ventilation so that commuters stay healthy as they travel. This is especially important in transit tunnels, where commuters will stand in line and wait for their train. These commuters need clean air, no matter where they are in the tunnel. Technicians also need adequate ventilation as they work to maintain the many transit systems behind the scenes. \u003C\u002Fp>\n\u003Cp>HVAC systems in tunnels are built to keep air circulating through every part of the tunnel. This often requires heavy duty equipment. These systems use a special type of damper to regulate air flow.\u003Cbr \u002F>\u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F10444\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Tunnel-Damper-collage.webp\" alt=\"Three examples of tunnel dampers\" \u002F>\u003Cfigcaption>Tunnel dampers are installed in tunnel systems to provide adequate ventilation.\u003C\u002Ffigcaption>\u003C\u002Ffigure>\n\u003Ch2>\u003Cbr \u002F>\u003C\u002Fh2>\n\u003Ch2>What is a Tunnel Damper?\u003C\u002Fh2>\n\u003Cp>Tunnel dampers are volume control dampers that are built to withstand the intense conditions of tunnel air flow. They can be used for a variety of applications within a tunnel HVAC system, including air intake and exhaust. In this position, these dampers act like a standard control damper installed at a ventilation point. At an intake point, they open to allow air through the intake and close when the intake process is complete. For exhaust, the operation is the same: the damper opens to exhaust the air and closes when it’s done. \u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F10446\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Tunnel-Damper-wRender.webp\" alt=\"Tunnel dampers in the factory\" \u002F>\u003Cfigcaption>Assemblers check a complete tunnel damper assembly. Tunnel dampers can be exceptionally large.\u003C\u002Ffigcaption>\u003C\u002Ffigure>\n\u003Cp>\u003Cbr \u002F>\u003C\u002Fp>\n\u003Cp>Tunnel dampers are built from galvanized and stainless steel, although they can also be made from thick gauge extruded aluminum. The damper must be able to withstand intense static pressures and high velocity airflow. For instance, AWV’s VC-51 is built to operate in air conditions with up to 60 in. w.g. of static pressure and air velocities up to 8000 feet per minute (FPM). To compare this with a standard control damper, our VC-28\u002F29 can operate in air conditions with up to 4 in. w.g. of static pressure and 4000 FPM. \u003C\u002Fp>\n\u003Cp>As you can see, tunnel dampers are built for extreme air conditions. Tunnel HVAC requires heavy duty dampers for these scenarios. \u003C\u002Fp>\n\u003Cp>\u003Cbr \u002F>\u003C\u002Fp>\n\u003Ch2>Tunnel Dampers and the Piston Effect\u003C\u002Fh2>\n\u003Cp>Transit tunnels have an additional aspect to consider. Trains will come and go through these tunnels, moving at incredible speeds, to get passengers to their next stop. Depending on the layout, trains may pass into the tunnel system from an outside station. High-speed trains, like those used in subways, can create gusts of air as they pass through the tunnel. This is called the piston effect. As the train passes through the tunnel, it creates positive air pressure at the front of the train and negative pressure towards the back of the train. \u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F10443\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Tunnel-Damper-3.webp\" alt=\"Subway train entering the station\" \u002F>\u003Cfigcaption>Trains move quickly through tunnel systems, creating imbalances in air pressure as they move.\u003C\u002Ffigcaption>\u003C\u002Ffigure>\n\u003Cp>As the train moves, it pushes the air ahead of it while it pulls the air behind it. The ultimate result resembles a motor piston, except that the air coming in can pass through the opening at the other side of the tunnel. The piston effect has its benefits. Trains can create passive ventilation through the tunnel by pushing old air out of the area and bringing in air from outside. However, the air is delivered as a single massive gust. The air will also be unconditioned. Imagine waiting for the train on a muggy day, only to be blasted by muggy air as your train arrives. Commuters would have to bundle up in the winter if they planned to wait for their train. The incoming air will also contain fumes from the train, which will build up in the tunnels without proper ventilation. \u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F10442\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Tunnel-Damper-2.webp\" alt=\"Open tunnel dampers in a tunnel system\" \u002F>\u003Cfigcaption>Tunnel dampers open to relieve air pressure and to direct airflow throughout the system.\u003C\u002Ffigcaption>\u003C\u002Ffigure>\n\u003Cp>You can help mitigate the piston effect by installing tunnel dampers at the entrance and exit points of the tunnel. The tunnel dampers will open as the train moves through the opening, relieving the air pressure as the train passes. Trains can produce massive amounts of air pressure as they pass, so each tunnel damper is built to withstand these intense conditions. These dampers can lead into the tunnel’s HVAC system, so that the air can be cleaned, conditioned, and distributed through the tunnel. Or, the dampers can lead to tunnel exhaust points, so that the air doesn’t mingle with the conditioned air from the system. Commuters still receive all the benefits of fresh air. They stay comfortable as they wait for their train, with tunnel dampers in place. \u003C\u002Fp>\n\u003Cp>\u003Cbr \u002F>\u003C\u002Fp>\n\u003Ch2>Other Uses for Tunnel Dampers\u003C\u002Fh2>\n\u003Cp>HVAC systems must be equipped with passive fire protection devices, like fire and smoke dampers, to help contain the flames and slow their spread into other areas. Tunnel dampers can be used for smoke control during a fire event, but they must meet several of the following standards to be used as a smoke control device:\u003C\u002Fp>\n\u003Cul>\u003Cli>NFPA-130, Standard for Fixed Guideway Transit and Passenger Rail Systems\u003C\u002Fli>\u003Cli>NFPA-502, Standard on Subterranean Spaces\u003C\u002Fli>\u003Cli>UL 555S for Smoke Dampers\u003C\u002Fli>\u003Cli>BS 476 (UK) for Fire Tests\u003C\u002Fli>\u003C\u002Ful>\n\u003Cp>Additionally, the tunnel damper should be equipped with a smoke detector. Check out \"\u003Ca href=\"https:\u002F\u002Fcms.awv.com\u002Fblog\u002Fsmoke-damper-vs-fire-damper\" target=\"_blank\" rel=\"noreferrer noopener\">Smoke Damper Vs Fire Damper: Understanding the Differences\u003C\u002Fa>” for more information on smoke dampers and passive fire protection.\u003C\u002Fp>\n\u003Cp>Tunnel dampers help ensure that commuters have fresh, conditioned air at the station. They ensure that tunnels are safe and comfortable places to work.\u003C\u002Fp>\n\u003Cfigure class=\"image\">\u003Cimg src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F10440\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Feature-Image.webp\" alt=\"Tunnel dampers from AWV\" \u002F>\u003Cfigcaption>AWV builds tunnel dampers for a wide range of applications. Contact us today and tell us what you need!\u003C\u002Ffigcaption>\u003C\u002Ffigure>\n\u003Ch2>AWV and Tunnel Dampers\u003C\u002Fh2>\n\u003Cp>Starting a tunnel project? You need dampers built to withstand the rigors of the toughest environments. Consider adding tunnel dampers from American Warming and Ventilating (AWV). At AWV, we build our tunnel dampers to meet the demands of tunnel and subterranean applications. We can help you meet your tunnel airflow requirements, with dampers built for over 60 in. w.g. static pressure. \u003C\u002Fp>\n\u003Cp>Need a tunnel damper for passive fire protection? Our TFD-75 exceeds the limits for BS 476 compliant construction and meets the standards of NFPA 130. \u003Ca href=\"https:\u002F\u002Fawv.com\u002Fcontact\" target=\"_blank\" rel=\"noreferrer noopener\">Contact AWV today! \u003C\u002Fa>Let us help you build the right dampers for your project.\u003C\u002Fp>",[35],{"__typename":36,"url":37},"blog_Asset","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Feature-Image.png",[39],{"__typename":40,"id":41,"ctaBackgroundImage":42,"ctaButtonText":43,"ctaFormHandle":44,"ctaHeadline":45,"ctaIsFeaturedImageHidden":46,"ctaThankYouRedirectPath":47,"ctaFeaturedImage":48},"callToActions_Entry","5221",[],"Free Damper Guide","damperSelectionGuideInlineForm","SELECT THE RIGHT DAMPER FOR YOUR APPLICATION",true,"\u002Fthank-you?source=damper_guide",[49],{"__typename":50,"ctaFeaturedImageOptimizedImages":51},"callToActions_Asset",{"src":52,"srcset":53,"srcWebp":54,"srcsetWebp":55,"maxSrcsetWidth":56,"placeholderImage":57,"placeholderBox":58,"placeholderSilhouette":59},"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbydamper_offer.png","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbydamper_offer.png 200w, https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_600x559_crop_center-center_60_line\u002Fawv_solutionsbydamper_offer.png 600w","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbydamper_offer.png.webp","https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_200x186_crop_center-center_60_line\u002Fawv_solutionsbydamper_offer.png.webp 200w, https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fcall-to-actions\u002F_transforms\u002F_600x559_crop_center-center_60_line\u002Fawv_solutionsbydamper_offer.png.webp 600w",600,"data:image\u002Fjpeg;base64,%2F9j%2F4AAQSkZJRgABAQIAOwA7AAD%2F2wBDABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkzODdASFxOQERXRTc4UG1RV19iZ2hnPk1xeXBkeFxlZ2P%2F2wBDARESEhgVGC8aGi9jQjhCY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2P%2FwAARCAAOABADASIAAhEBAxEB%2F8QAFgABAQEAAAAAAAAAAAAAAAAABQID%2F8QAIBAAAgEEAgMBAAAAAAAAAAAAAQIDAAQFERIiIUFxkf%2FEABUBAQEAAAAAAAAAAAAAAAAAAAAB%2F8QAFhEBAQEAAAAAAAAAAAAAAAAAABFB%2F9oADAMBAAIRAxEAPwAq0aM2EVwIbFgU7K0I2GFAZBC0pn4onM%2BVQaA%2BVrjpyIjH6VuW6rI5CCdVjSA9ARsnQ%2FBSrj%2F%2F2Q%3D%3D","data:image\u002Fsvg+xml,%3Csvg%20xmlns=%27http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg%27%20width=%27600%27%20height=%27559%27%20style=%27background:%23bbafa7%27%20\u002F%3E","data:image\u002Fsvg+xml,%3Csvg%20xmlns=%27http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg%27%20width=%271%27%20height=%271%27%20style=%27background:%23CCC%27%20\u002F%3E",[61,66,70,74],{"__typename":62,"id":63,"tagName":19,"slug":64,"title":65},"blogPostsTags_Tag","10371","tunnel-dampers","tunnel dampers",{"__typename":62,"id":67,"tagName":19,"slug":68,"title":69},"10372","piston-effect","piston effect",{"__typename":62,"id":71,"tagName":19,"slug":72,"title":73},"5644","dampers","Dampers",{"__typename":62,"id":75,"tagName":19,"slug":76,"title":77},"10575","hvac","HVAC",[79],{"__typename":36,"url":80},"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002FAWV-2024-Blogs-Tunnel-Damper-and-the-Piston-Effect-Banner-Image.png",[],{"metaJsonLdContainer":83,"metaLinkContainer":84,"metaScriptContainer":85,"metaTagContainer":86,"metaTitleContainer":87},"{\"mainEntityOfPage\":{\"@context\":\"https:\\\u002F\\\u002Fschema.org\",\"@type\":\"CreativeWork\",\"author\":{\"@id\":\"#identity\"},\"copyrightHolder\":{\"@id\":\"#identity\"},\"copyrightYear\":\"2024\",\"creator\":{\"@id\":\"#creator\"},\"dateCreated\":\"2023-11-07T09:14:50-05:00\",\"dateModified\":\"2024-03-08T10:51:53-05:00\",\"datePublished\":\"2024-01-17T06:00:00-05:00\",\"description\":\"Tunnel dampers are volume control dampers that are built to withstand the intense conditions of tunnel air flow. 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Take it online at your own pace and earn learning units through our AIA Providership.","\u003Cp>Louvers are an essential part of every HVAC system, facilitating appropriate airflow and inhibiting unwanted penetration by water, snow, or debris through wall openings and into HVAC ductwork. However, they can have other purposes. Their straightforward design makes them a versatile addition and a unique style option for any project.\u003C\u002Fp>\n\u003Cp>\u003C\u002Fp>\n\u003Cp>Take \"Louvers for Style and Aesthetics\" today and earn learning units through our AIA Providership. You can take the course online and learn at your own pace or schedule a live learning session. AWV offers in-person sessions and webinars, taught by our louver experts. 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