--- title: The Basics of Displacement Ventilation description: Displacement ventilation can supply fresh air at occupant level, forcing contaminated air up and out of the space. It offers a low noise level and reduced energy consumption. image: https://info.hoffman-hoffman.com/hubfs/Screen%20Shot%202020-10-05%20at%2011.24.18%20AM.png --- - [(336) 292-8777](tel:+3362928777) - [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) [Blog](https://blog.hoffman-hoffman.com/blog) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-icon-svg.svg)](https://www.facebook.com/HoffmanHoffmanInc) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-icon-svg.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-icon-svg.svg)](https://twitter.com/HoffandHoffInc) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-icon-svg.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) [![cropped-hoffman-logo](https://info.hoffman-hoffman.com/hs-fs/hubfs/Blog-Assets-April-2020/Images/cropped-hoffman-logo.png?width=1457&height=281&name=cropped-hoffman-logo.png "cropped-hoffman-logo")](http://hoffman-hoffman.com) - [Equipment](https://www.hoffman-hoffman.com/equipment/) - [In-Stock Catalog with Prices](https://issuu.com/hoffman-hoffman/docs/hh_2019_single_print?e=2500206/65071024) - [Projects](https://www.hoffman-hoffman.com/project-types/) - [Commercial Office Buildings](https://www.hoffman-hoffman.com/project-types/commercial-office-buildings/) - [Data Centers](https://www.hoffman-hoffman.com/project-types/data-centers/) - [Hospitality](https://www.hoffman-hoffman.com/project-types/hospitality/) - [Hospitals & Medical Offices](https://www.hoffman-hoffman.com/project-types/hospitals-medical-offices/) - [Automation](https://www.hoffman-hoffman.com/automation/) - [Services](https://www.hoffman-hoffman.com/services/) - [Training](https://www.hoffman-hoffman.com/training/) - [Parts](https://www.hoffman-hoffman.com/parts/) - [About Us](https://www.hoffman-hoffman.com/the-hoffman-way/) - [History](https://www.hoffman-hoffman.com/the-hoffman-way/history/) - [Work With Us](https://www.hoffman-hoffman.com/the-hoffman-way/work-with-us/) - [Contact Us](https://www.hoffman-hoffman.com/the-hoffman-way/contact/) - [Privacy Policy](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Privacy-Policy-FINAL-2020.04.07-.pdf) - [Terms of Use](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Hoffman-Website-Terms-of-Use-FINAL-2020.04.07-.pdf) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search.svg) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search-white.svg) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/marker-white.svg) #### Main Office 3816 Patterson St Greensboro, NC 27407 23 #### Hours of Operation 8AM to 5PM - Monday - Friday Closed Saturday and Sunday *We offer 24/7 emergency repair service* ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Stock Warehouse [(800) 334-0254](tel:+8003340254) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Replacement Parts [(800) 332-2295](tel:8003322295) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Consultation / Evaluation: [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Parts: [parts@hoffman-hoffman.com](mailto:parts@hoffman-hoffman.com) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-white.svg)](https://www.facebook.com/HoffmanHoffmanInc/) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-white.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-white.svg)](https://twitter.com/HoffandHoffInc) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-white.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) [![cropped-hoffman-logo](https://info.hoffman-hoffman.com/hs-fs/hubfs/Blog-Assets-April-2020/Images/cropped-hoffman-logo.png?width=1457&height=281&name=cropped-hoffman-logo.png "cropped-hoffman-logo")](http://hoffman-hoffman.com) - [Equipment](https://www.hoffman-hoffman.com/equipment/) - [In-Stock Catalog with Prices](https://issuu.com/hoffman-hoffman/docs/hh_2019_single_print?e=2500206/65071024) - [Projects](https://www.hoffman-hoffman.com/project-types/) - [Commercial Office Buildings](https://www.hoffman-hoffman.com/project-types/commercial-office-buildings/) - [Data Centers](https://www.hoffman-hoffman.com/project-types/data-centers/) - [Hospitality](https://www.hoffman-hoffman.com/project-types/hospitality/) - [Hospitals & Medical Offices](https://www.hoffman-hoffman.com/project-types/hospitals-medical-offices/) - [Automation](https://www.hoffman-hoffman.com/automation/) - [Services](https://www.hoffman-hoffman.com/services/) - [Training](https://www.hoffman-hoffman.com/training/) - [Parts](https://www.hoffman-hoffman.com/parts/) - [About Us](https://www.hoffman-hoffman.com/the-hoffman-way/) - [History](https://www.hoffman-hoffman.com/the-hoffman-way/history/) - [Work With Us](https://www.hoffman-hoffman.com/the-hoffman-way/work-with-us/) - [Contact Us](https://www.hoffman-hoffman.com/the-hoffman-way/contact/) - [Privacy Policy](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Privacy-Policy-FINAL-2020.04.07-.pdf) - [Terms of Use](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Hoffman-Website-Terms-of-Use-FINAL-2020.04.07-.pdf) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search.svg) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search-white.svg) [![mob-logo](https://info.hoffman-hoffman.com/hs-fs/hubfs/Blog-Assets-April-2020/Images/mob-logo.png?width=201&height=201&name=mob-logo.png "mob-logo")](http://hoffman-hoffman.com) - [Equipment](https://www.hoffman-hoffman.com/equipment/) - [In-Stock Catalog with Prices](https://issuu.com/hoffman-hoffman/docs/hh_2019_single_print?e=2500206/65071024) - [Projects](https://www.hoffman-hoffman.com/project-types/) - [Commercial Office Buildings](https://www.hoffman-hoffman.com/project-types/commercial-office-buildings/) - [Data Centers](https://www.hoffman-hoffman.com/project-types/data-centers/) - [Hospitality](https://www.hoffman-hoffman.com/project-types/hospitality/) - [Hospitals & Medical Offices](https://www.hoffman-hoffman.com/project-types/hospitals-medical-offices/) - [Automation](https://www.hoffman-hoffman.com/automation/) - [Services](https://www.hoffman-hoffman.com/services/) - [Training](https://www.hoffman-hoffman.com/training/) - [Parts](https://www.hoffman-hoffman.com/parts/) - [About Us](https://www.hoffman-hoffman.com/the-hoffman-way/) - [History](https://www.hoffman-hoffman.com/the-hoffman-way/history/) - [Work With Us](https://www.hoffman-hoffman.com/the-hoffman-way/work-with-us/) - [Contact Us](https://www.hoffman-hoffman.com/the-hoffman-way/contact/) - [Privacy Policy](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Privacy-Policy-FINAL-2020.04.07-.pdf) - [Terms of Use](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Hoffman-Website-Terms-of-Use-FINAL-2020.04.07-.pdf) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search.svg) ## WE BUILD THE FUTURE #### recent posts ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [Maximizing Efficiency and Comfort: The Price Ultrasuite for Hospital Operating Rooms](https://info.hoffman-hoffman.com/blog/maximizing-efficiency-and-comfort-the-price-ultrasuite-for-hospital-operating-rooms) - [Dehumidification: Ensuring Optimal Conditions in Critical Environments](https://info.hoffman-hoffman.com/blog/dehumidification-ensuring-optimal-conditions-in-critical-environments) - [Bridging the Gap: Celebrating Sales Engineers During Engineers Week](https://info.hoffman-hoffman.com/blog/bridging-the-gap-celebrating-sales-engineers-during-engineers-week) - [For the Love of HVAC: A Career Story](https://info.hoffman-hoffman.com/blog/for-the-love-of-hvac-a-career-story) - [MERV-A Ratings Make the Best Filters Stand Out from the Crowd](https://info.hoffman-hoffman.com/blog/merv-a-ratings-make-the-best-filters-stand-out-from-the-crowd) #### popular ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [ABB ACH580 Drives: Override Mode](https://info.hoffman-hoffman.com/blog/abb-ach580-drives-override-mode) - [Understanding HVAC Load Calculations for Commercial Spaces](https://info.hoffman-hoffman.com/blog/understanding-hvac-load-calculations-for-commercial-spaces) - [High Stakes, High Comfort: The HVAC Demands of Casinos](https://info.hoffman-hoffman.com/blog/high-stakes-high-comfort-the-hvac-demands-of-casinos) - [Psychrometrics – The Essence of HVAC](https://info.hoffman-hoffman.com/blog/psychrometrics-the-essence-of-hvac) - [HVAC Products for Magnetic Resonance Imaging (MRI) Applications](https://info.hoffman-hoffman.com/blog/hvac-products-for-magnetic-resonance-imaging-mri-applications) #### tags ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [Commercial HVAC](https://info.hoffman-hoffman.com/blog/tag/commercial-hvac) - [indoor air quality](https://info.hoffman-hoffman.com/blog/tag/indoor-air-quality) - [HVAC](https://info.hoffman-hoffman.com/blog/tag/hvac) - [Price Industries](https://info.hoffman-hoffman.com/blog/tag/price-industries) - [Greenheck](https://info.hoffman-hoffman.com/blog/tag/greenheck) - [Ventilation](https://info.hoffman-hoffman.com/blog/tag/ventilation) - [Careers](https://info.hoffman-hoffman.com/blog/tag/careers) - [energy efficiency](https://info.hoffman-hoffman.com/blog/tag/energy-efficiency) - [HVAC expertise](https://info.hoffman-hoffman.com/blog/tag/hvac-expertise) - [commercial hvac system](https://info.hoffman-hoffman.com/blog/tag/commercial-hvac-system) - [healthy air](https://info.hoffman-hoffman.com/blog/tag/healthy-air) - [air circulation](https://info.hoffman-hoffman.com/blog/tag/air-circulation) - [k-12 schools](https://info.hoffman-hoffman.com/blog/tag/k-12-schools) - [ASHRAE](https://info.hoffman-hoffman.com/blog/tag/ashrae) - [ESOP](https://info.hoffman-hoffman.com/blog/tag/esop) - [Global Plasma Solutions](https://info.hoffman-hoffman.com/blog/tag/global-plasma-solutions) - [air quality](https://info.hoffman-hoffman.com/blog/tag/air-quality) - [hospitals](https://info.hoffman-hoffman.com/blog/tag/hospitals) - [Ruskin](https://info.hoffman-hoffman.com/blog/tag/ruskin) - [ABB](https://info.hoffman-hoffman.com/blog/tag/abb) - [Building](https://info.hoffman-hoffman.com/blog/tag/building) - [Camfil](https://info.hoffman-hoffman.com/blog/tag/camfil) - [filtration](https://info.hoffman-hoffman.com/blog/tag/filtration) - [Air Purification](https://info.hoffman-hoffman.com/blog/tag/air-purification) - [Big Ass Fans](https://info.hoffman-hoffman.com/blog/tag/big-ass-fans) - [Daikin Applied](https://info.hoffman-hoffman.com/blog/tag/daikin-applied) - [Louvers](https://info.hoffman-hoffman.com/blog/tag/louvers) - [NPBI](https://info.hoffman-hoffman.com/blog/tag/npbi) - [Needlepoint Bipolar Ionization](https://info.hoffman-hoffman.com/blog/tag/needlepoint-bipolar-ionization) - [air handler](https://info.hoffman-hoffman.com/blog/tag/air-handler) - [comfort](https://info.hoffman-hoffman.com/blog/tag/comfort) - [Continuing Education](https://info.hoffman-hoffman.com/blog/tag/continuing-education) - [Dampers](https://info.hoffman-hoffman.com/blog/tag/dampers) - [Ductwork](https://info.hoffman-hoffman.com/blog/tag/ductwork) - [HVLS Fans](https://info.hoffman-hoffman.com/blog/tag/hvls-fans) - [air pollution](https://info.hoffman-hoffman.com/blog/tag/air-pollution) - [energy recovery](https://info.hoffman-hoffman.com/blog/tag/energy-recovery) - [engineer tools](https://info.hoffman-hoffman.com/blog/tag/engineer-tools) - [training](https://info.hoffman-hoffman.com/blog/tag/training) - [universities](https://info.hoffman-hoffman.com/blog/tag/universities) - [Building Safety](https://info.hoffman-hoffman.com/blog/tag/building-safety) - [Daikin](https://info.hoffman-hoffman.com/blog/tag/daikin) - [DuctSox](https://info.hoffman-hoffman.com/blog/tag/ductsox) - [PDH Credits](https://info.hoffman-hoffman.com/blog/tag/pdh-credits) - [Sustainability](https://info.hoffman-hoffman.com/blog/tag/sustainability) - [VFDs](https://info.hoffman-hoffman.com/blog/tag/vfds) - [Webinar](https://info.hoffman-hoffman.com/blog/tag/webinar) - [airborne illnesses](https://info.hoffman-hoffman.com/blog/tag/airborne-illnesses) - [engineer](https://info.hoffman-hoffman.com/blog/tag/engineer) - [volume control](https://info.hoffman-hoffman.com/blog/tag/volume-control) - [Evapco](https://info.hoffman-hoffman.com/blog/tag/evapco) - [Nortek](https://info.hoffman-hoffman.com/blog/tag/nortek) - [Safety](https://info.hoffman-hoffman.com/blog/tag/safety) - [Stationary Louvers](https://info.hoffman-hoffman.com/blog/tag/stationary-louvers) - [energysolutions](https://info.hoffman-hoffman.com/blog/tag/energysolutions) - [facilities management](https://info.hoffman-hoffman.com/blog/tag/facilities-management) - [molecular filters](https://info.hoffman-hoffman.com/blog/tag/molecular-filters) - [pressurized room](https://info.hoffman-hoffman.com/blog/tag/pressurized-room) - [AHU](https://info.hoffman-hoffman.com/blog/tag/ahu) - [Architectural Design](https://info.hoffman-hoffman.com/blog/tag/architectural-design) - [Architectural Solutions](https://info.hoffman-hoffman.com/blog/tag/architectural-solutions) - [Automatic Balancing Dampers](https://info.hoffman-hoffman.com/blog/tag/automatic-balancing-dampers) - [Baldor Motors](https://info.hoffman-hoffman.com/blog/tag/baldor-motors) - [COVID-19](https://info.hoffman-hoffman.com/blog/tag/covid-19) - [CamCarb](https://info.hoffman-hoffman.com/blog/tag/camcarb) - [Controls](https://info.hoffman-hoffman.com/blog/tag/controls) - [Custom HVAC](https://info.hoffman-hoffman.com/blog/tag/custom-hvac) - [DOAS](https://info.hoffman-hoffman.com/blog/tag/doas) - [Data Centers](https://info.hoffman-hoffman.com/blog/tag/data-centers) - [Dedicated Outdoor Air System](https://info.hoffman-hoffman.com/blog/tag/dedicated-outdoor-air-system) - [Dehumidification](https://info.hoffman-hoffman.com/blog/tag/dehumidification) - [Haakon](https://info.hoffman-hoffman.com/blog/tag/haakon) - [Heat Pump](https://info.hoffman-hoffman.com/blog/tag/heat-pump) - [Make-up Air](https://info.hoffman-hoffman.com/blog/tag/make-up-air) - [Munters](https://info.hoffman-hoffman.com/blog/tag/munters) - [Remote Assistance](https://info.hoffman-hoffman.com/blog/tag/remote-assistance) - [Remote Monitoring](https://info.hoffman-hoffman.com/blog/tag/remote-monitoring) - [Revit Tool](https://info.hoffman-hoffman.com/blog/tag/revit-tool) - [Technicians](https://info.hoffman-hoffman.com/blog/tag/technicians) - [UL certified](https://info.hoffman-hoffman.com/blog/tag/ul-certified) - [Water Treatment Systems](https://info.hoffman-hoffman.com/blog/tag/water-treatment-systems) - [Zoning](https://info.hoffman-hoffman.com/blog/tag/zoning) - [ceiling exhaust fan](https://info.hoffman-hoffman.com/blog/tag/ceiling-exhaust-fan) - [chillers](https://info.hoffman-hoffman.com/blog/tag/chillers) - [cooling towers](https://info.hoffman-hoffman.com/blog/tag/cooling-towers) - [designer](https://info.hoffman-hoffman.com/blog/tag/designer) - [drives](https://info.hoffman-hoffman.com/blog/tag/drives) - [eCAPS](https://info.hoffman-hoffman.com/blog/tag/ecaps) - [environmentally friendly](https://info.hoffman-hoffman.com/blog/tag/environmentally-friendly) - [essence](https://info.hoffman-hoffman.com/blog/tag/essence) - [evaporative cooling equipment](https://info.hoffman-hoffman.com/blog/tag/evaporative-cooling-equipment) - [project profile](https://info.hoffman-hoffman.com/blog/tag/project-profile) - [refrigerant](https://info.hoffman-hoffman.com/blog/tag/refrigerant) - [rooftop systems](https://info.hoffman-hoffman.com/blog/tag/rooftop-systems) - [uvdi systems](https://info.hoffman-hoffman.com/blog/tag/uvdi-systems) - [venmar](https://info.hoffman-hoffman.com/blog/tag/venmar) - [ventilators](https://info.hoffman-hoffman.com/blog/tag/ventilators) # The Basics of Displacement Ventilation ![](https://info.hoffman-hoffman.com/hubfs/calender-icon-black.png) October 5, 2020 ![](https://info.hoffman-hoffman.com/hubfs/Screen%20Shot%202020-10-05%20at%2011.24.18%20AM.png) Indoor air quality has become a hot topic of conversation in 2020.   Offices, restaurants, museums, and other indoor areas have been shut down for extended periods of time due to the global pandemic, leaving many building owners, engineers, and facilities teams to question what they can do to improve indoor air quality and lessen the chances of building occupants being exposed to viruses like COVID-19. Our team has suggested a number of ways to [improve indoor air quality](https://info.hoffman-hoffman.com/blog/improve-your-buildings-indoor-air-quality) for occupants. Our manufacturing partners at Price Industries offer yet another suggestion: [displacement ventilation](https://info.hoffman-hoffman.com/blog/improve-air-quality-in-schools-with-displacement-ventilation). Displacement ventilation is an alternative solution to mixed-flow ventilation in commercial HVAC systems. What is displacement ventilation (DV)? DV uses fresh air supplied by displacement ventilation diffusers. This fresh air is then warmed by building heat sources like occupants, computers, lights, and other objects in the room. After the air is warmed, it is drawn up and exhausted through high level returns. Heat sources in the room receives fresh supply air that corresponds to their output, so higher heat sources receive MORE supply air while lower heat sources receive less. This helps to ensure occupant comfort throughout the space. In overhead mixing systems, the supply air is delivered to the occupied space from above and fully mixed with all the air to dilute any contaminants. ![mixed-flow systems](https://info.hoffman-hoffman.com/hs-fs/hubfs/Screen%20Shot%202020-10-05%20at%2011.23.47%20AM.png?width=600&name=Screen%20Shot%202020-10-05%20at%2011.23.47%20AM.png) In displacement ventilation, the fresh air is delivered from below, forcing contaminated air up and out. Fresh air is free to move into the space continually and moves up as it is heated by the room sources. Since the air leaves by the returns, it never re-enters the occupied space. ![displacement ventilation](https://info.hoffman-hoffman.com/hs-fs/hubfs/Screen%20Shot%202020-10-05%20at%2011.24.18%20AM.png?width=600&name=Screen%20Shot%202020-10-05%20at%2011.24.18%20AM.png) Displacement ventilation is suitable for a number of applications using a variety of considerations, including: - **Noise level:** Because displacement ventilation supplies air at a lower velocity to avoid creating uncomfortable cool drafts, the fans move more slowly which produces less noise. In a classroom or conference room, these lower noise levels could be preferred. - **Life cycle costs:** Due to the lower velocity fans, displacement ventilation can consume less energy than a mixed-flow system. Additionally, the supply air temperature is a bit higher in a displacement ventilation system. - **High ceilings:** Higher ceilings enable the displacement ventilation system to remove larger heat loads. Displacement ventilation can be a viable alternative to traditional mixed-flow designs when all design parameters are taken into consideration. Connect with your local manufacturer’s rep to see if displacement ventilation should be considered for your commercial HVAC application. For a more in-depth look at displacement ventilation, take a look at the training video on displacement ventilation from Price Industries.   Blog content and images sourced from Price Industries.   ##### // about the author ![Kelly Patterson](https://info.hoffman-hoffman.com/hubfs/KT%20avatar.jpg) ### ![](https://info.hoffman-hoffman.com/hubfs/user.png) [Kelly Patterson](https://info.hoffman-hoffman.com/blog/author/kelly-patterson) Kelly Patterson is a lifelong learner and the marketing director at the Hoffman family of companies. There is nothing she likes more than talking about commercial HVAC systems and extraordinary customer service. ##### // share this post - - - - [mailto:?body=https://info.hoffman-hoffman.com/blog/the-basics-of-displacement-ventilation](mailto:?body=https://info.hoffman-hoffman.com/blog/the-basics-of-displacement-ventilation) - ### Recent Posts ### categories - [ABB (6)](https://info.hoffman-hoffman.com/blog/tag/abb) - [AHU (1)](https://info.hoffman-hoffman.com/blog/tag/ahu) - [air circulation (9)](https://info.hoffman-hoffman.com/blog/tag/air-circulation) - [air handler (5)](https://info.hoffman-hoffman.com/blog/tag/air-handler) - [air pollution (4)](https://info.hoffman-hoffman.com/blog/tag/air-pollution) - [Air Purification (5)](https://info.hoffman-hoffman.com/blog/tag/air-purification) - [air quality (8)](https://info.hoffman-hoffman.com/blog/tag/air-quality) - [airborne illnesses (3)](https://info.hoffman-hoffman.com/blog/tag/airborne-illnesses) - [Architectural Design (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-design) - [Architectural Solutions (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-solutions) - [ASHRAE (8)](https://info.hoffman-hoffman.com/blog/tag/ashrae) - [Automatic Balancing Dampers (1)](https://info.hoffman-hoffman.com/blog/tag/automatic-balancing-dampers) - [Baldor Motors (1)](https://info.hoffman-hoffman.com/blog/tag/baldor-motors) - [Big Ass Fans (5)](https://info.hoffman-hoffman.com/blog/tag/big-ass-fans) - [Building (6)](https://info.hoffman-hoffman.com/blog/tag/building) ### subscribe #### Our Location Main Office 3816 Patterson St Greensboro, NC 27407 #### Hours of Operation 8AM to 5PM – Monday through Friday Closed Saturday and Sunday *We offer 24/7 emergency repair service* #### Contact Us ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Main Office [(336) 292-8777](tel:+3362928777) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Stock Warehouse [(800) 334-0254](tel:+8003340254) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Replacement Parts [(800) 332-2295](tel:+8003322295) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Consultation / Evaluation: [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) Hoffman & Hoffman, Inc., Hoffman Building Technologies, Inc., Hoffman Mechanical Solutions, Inc., and Heat Transfer Sales, LLC, are separate legal entities. ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/footer-logo.png) All content © 2019, Hoffman & Hoffman [![Facebook](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-white.svg)](https://www.facebook.com/HoffmanHoffmanInc) [![Instagram](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-white.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![Twitter](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-white.svg)](https://twitter.com/HoffandHoffInc) [![LinkedIn](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-white.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Kelly Patterson", "url" : "https://info.hoffman-hoffman.com/blog/author/kelly-patterson" }, "dateModified" : "2020-12-07T16:30:17.857Z", "datePublished" : "2020-10-05T18:28:51.000Z", "headline" : "The Basics of Displacement Ventilation", "image" : [ "https://info.hoffman-hoffman.com/hubfs/Screen%20Shot%202020-10-05%20at%2011.24.18%20AM.png" ], "mainEntityOfPage" : { "@id" : "https://info.hoffman-hoffman.com/blog/the-basics-of-displacement-ventilation", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://info.hoffman-hoffman.com/hubfs/HH_Logo_RGB.png" }, "name" : "Hoffman & Hoffman, Inc." } } ```