--- title: The Science of Comfort - Price Industries HVAC blog | ASHRAE 70 description: ASHRAE 70 | Price Industries is committed to innovation, science, technology, business integrity, first-class service, and dedication to people. Our dependable quality, reliable delivery, and knowledgeable follow-up service have made Price a market leader in supplying air distribution, critical controls, and noise control products to the non-residential HVAC market. --- ![PriceTraining\_Logo\_RGB-1](https://blog.priceindustries.com/hs-fs/hubfs/PriceTraining_Logo_RGB-1.png?width=303&height=58&name=PriceTraining_Logo_RGB-1.png)   [![Price Industries](https://blog.priceindustries.com/hubfs/Priceindustries-March-2018/Images/Price_Logo_Blue.svg)](https://www.priceindustries.com/) The Science of ComfortTM ## The Science of Comfort Your Premier Source for All Things HVAC ## [GRD in Real Life](https://blog.priceindustries.com/grd-in-real-life) Posted by [Ryan Johnson, PE](https://blog.priceindustries.com/author/ryan-johnson) on November 12, 2025 at 9:00 AM - [Tweet](https://twitter.com/share) [![GRD wall at Price Technical Center West](https://blog.priceindustries.com/hubfs/GRD%20Wall%20PTCW_1.jpg)](https://blog.priceindustries.com/grd-in-real-life) ## Cool Tips and Hot Takes for Air Distribution Design At Price, we pride ourselves on our contributions to *The Science of Comfort*™ (we have the phrase trademarked, after all). If you’re a regular reader of the blog, you’ll understand the rigorous testing and research behind all the air distribution solutions we manufacture. Our team at [Price Research Center North](https://blog.priceindustries.com/explore-price-research-center-north) (PRCN) in Winnipeg, MB, is accustomed to maintaining the highest test standards and methodologies behind the data published in [our catalog](https://info.priceindustries.com/catalog-handbook-orders). [Read More](https://blog.priceindustries.com/grd-in-real-life) 0 Comments [Click here to read/write comments](https://blog.priceindustries.com/grd-in-real-life#comments-listing) Topics: [GRD](https://blog.priceindustries.com/tag/grd), [Diffusers](https://blog.priceindustries.com/tag/diffusers), [ASHRAE 70](https://blog.priceindustries.com/tag/ashrae-70), [Inlet Effect](https://blog.priceindustries.com/tag/inlet-effect), [Grilles](https://blog.priceindustries.com/tag/grilles), [Static Pressure](https://blog.priceindustries.com/tag/static-pressure), [Pressure Drop](https://blog.priceindustries.com/tag/pressure-drop), [Inlet Conditions](https://blog.priceindustries.com/tag/inlet-conditions), [Mock-Up](https://blog.priceindustries.com/tag/mock-up), [HVAC](https://blog.priceindustries.com/tag/hvac), [Engineering](https://blog.priceindustries.com/tag/engineering), [Design Engineering](https://blog.priceindustries.com/tag/design-engineering), [Tech Tip](https://blog.priceindustries.com/tag/tech-tip) ## [What is Inlet Effect?](https://blog.priceindustries.com/what-is-inlet-effect) Posted by [Price Industries](https://blog.priceindustries.com/author/price-industries) on August 27, 2019 at 9:57 AM - [Tweet](https://twitter.com/share) [![SPD\_HardElbow\_v001](https://blog.priceindustries.com/hubfs/SPD_HardElbow_v001.png)](https://blog.priceindustries.com/what-is-inlet-effect) ## Inlet Effects  [ASHRAE Standard 70](https://www.techstreet.com/ashrae/standards/ashrae-70-2006?gateway_code=ashrae&product_id=1276665) guidelines are in place so that ideal conditions are present during GRD testing and to ensure the testing is repeatable. It is important to note that the performance published in the [Price catalog](https://www.priceindustries.com/) is based on these ideal conditions outlined in ASHRAE 70 and that any field modifications can affect the performance of the outlet. There are five common field conditions and their influence on the air pattern of a given diffuser: - Hard 90 Degree Elbow - 90 Degree Flexible Duct Elbow - [Radial Opposed Blade Damper](https://www.priceindustries.com/diffusers/products/vcr7-radial-opposed-blade-damper) - [Butterfly Damper](https://www.priceindustries.com/diffusers/products/vcr8-volume-control-dampers) - [Radial Damper](https://www.priceindustries.com/diffusers/products/vcr8-volume-control-dampers) [Read More](https://blog.priceindustries.com/what-is-inlet-effect) 7 Comments [Click here to read/write comments](https://blog.priceindustries.com/what-is-inlet-effect#comments-listing) Topics: [GRD](https://blog.priceindustries.com/tag/grd), [Diffusers](https://blog.priceindustries.com/tag/diffusers), [ASHRAE 70](https://blog.priceindustries.com/tag/ashrae-70), [Inlet Effect](https://blog.priceindustries.com/tag/inlet-effect), [Grilles](https://blog.priceindustries.com/tag/grilles) [All posts](https://blog.priceindustries.com/all) ## At Price, when we say “the sky is the limit,” we actually mean it. Our customers have come to count on a consistent and ever-increasing stream of new products and enhancements.  Price has a large team of experienced and talented engineers who are consistently working on breakthrough ideas.  We are not afraid to move into whole new product categories if we believe we have a contribution to make. - Research & Innovation - Technical Tours - Training Classes - Targeted Discussions - Mock-up Testing - Custom Solutions & Specials - Custom Finishes - Computational Fluid Dynamics - Virtual Reality ### Subscribe to Email Updates ### Recent Posts ### Posts by Topic - [HVAC (148)](https://blog.priceindustries.com/tag/hvac) - [Engineering (122)](https://blog.priceindustries.com/tag/engineering) - [Design Engineering (106)](https://blog.priceindustries.com/tag/design-engineering) - [HVAC Fundamentals (84)](https://blog.priceindustries.com/tag/hvac-fundamentals) - [Employees (38)](https://blog.priceindustries.com/tag/employees) - [Diffusers (32)](https://blog.priceindustries.com/tag/diffusers) - 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[Contact Product Support](https://www.priceindustries.com/contact/product-support) ### Price Industries - Who We Are The founding principles of Price have never changed – business integrity, first-class service, innovation and a commitment to people. Our dependable quality, reliable delivery, and knowledgeable follow-up service have made Price a market leader in supplying air distribution, critical controls, and noise control products. After more than 60 years, Price remains a privately held family company with a deep heritage and commitment to innovation and service. Our long-standing vision, traditional values, and the Price way of doing business are the cornerstones of our leadership position in the non-residential air distribution industry. - - [Privacy Policy](https://www.priceindustries.com/legal/privacypolicy) - [Engineering E-Update](https://www.priceindustries.com/signup/newsletter) - - [Contact Information](https://www.priceindustries.com/contact/reps-dealers?territory=International) - [Career Opportunities](https://www.priceindustries.com/corporate/careers) - [Our Services](https://www.priceindustries.com/services) ![Price Industries](https://blog.priceindustries.com/hubfs/Priceindustries-March-2018/Images/PriceLogo-footer.png) © 2018 Price Industries. All Rights Reserved. 2975 Shawnee Ridge Court - Suwanee, Georgia 30024 - (770) 623-8050. - **Current Market:** - [Canada](https://www.priceindustries.com/?SwitchMarket=Canada) - [United States](https://www.priceindustries.com/?SwitchMarket=United%20States) - [International](https://www.priceindustries.com/?SwitchMarket=International)