--- title: Key Features for Ultra-Low Freezer Performance description: Learn about the importance of the inner door design of a medical-grade Ultra-Low Temperature Freezer for maintaining the integrity of stored samples. image: https://blog.helmerinc.com/hubfs/Blog/2016/iUF126-Open-Door.jpg --- [![Helmer](https://blog.helmerinc.com/hs-fs/hubfs/HelmerScientific_September2019%20Theme/Images/helmer_logo.png?width=222&height=59&name=helmer_logo.png)](https://www.helmerinc.com/) - [Helmer Store](https://www.helmerinc.com/search?search%5B0%5D=product_category%3Adisposables&search%5B1%5D=product_category%3Aparts_and_accessories) - [Help Center](https://www.helmerinc.com/knowledge-center) - [Blog](https://blog.helmerinc.com/) - [Manuals](https://www.helmerinc.com/manuals) - [Distributor Resources](https://www.helmerinc.com/distributor-resources) - [Contact Us](https://www.helmerinc.com/contact-us) - [Request Quote](https://www.helmerinc.com/quote-request) - [Products](https://www.helmerinc.com/helmer-products) - 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[**Blue**View](https://blog.helmerinc.com) - Key Features for Ultra-Low Freezer Performance # Key Features for Ultra-Low Freezer Performance Posted on Nov 13, 2019 by Colleen Holtkamp ![Ultra Low Temperature Freezer - designed to protect stored samples](https://blog.helmerinc.com/hs-fs/hubfs/Blog/2016/iUF126-Open-Door.jpg?width=700&name=iUF126-Open-Door.jpg "Ultra Low Temperature Freezer - designed to protect stored samples") It seems obvious that an Ultra-Low freezer should be designed to protect stored samples from being exposed to adverse temperature conditions. Key features play a critical role in safeguarding valuable samples. There are, however, significant differences in how various Ultra-Low freezers are designed. One feature that is important to consider is the design of the inner doors. In addition to an outer door, Ultra-Low freezers characteristically incorporate inner doors to help protect the contents stored inside the cabinet. If the freezer has an inner door for each shelf within the unit, this creates enclosed storage compartments inside the freezer. A primary design goal for the inner doors should be to minimize the amount of warm air and moisture that enter the compartments during door openings. Design elements that should be considered are as follows: - Whether and how effectively the inner doors are insulated - Whether the design is sturdy enough to prevent sagging - Whether the inner doors are well sealed to prevent warm, moist air from entering the storage compartments Different Ultra-Low freezer models have used different approaches to sealing the inner doors, including no gaskets at all, limited sealing with single blade gaskets, and sealing but not on all four sides. In order to understand the impact of inner door gaskets, we conducted a study comparing a unit with no gaskets to one that is fully gasketed on all four sides. The study evaluated the freezer’s temperature performance in the storage compartments when the outer door is opened. Clinical and research facilities depend on Ultra-Low freezers to safeguard the integrity of precious samples. Read the white paper to find out more about the impact of inner doors on sample safety. [![Download the White Paper »](https://no-cache.hubspot.com/cta/default/1862406/17a87894-8c64-466a-8588-76939503a559.png)](https://cta-redirect.hubspot.com/cta/redirect/1862406/17a87894-8c64-466a-8588-76939503a559) ###### Other Blogs You May Be Interested In... - [Video Series:  Four Factors to Consider when Selecting an Ultra-Low Freezer](https://blog.helmerinc.com/four-factors-to-consider-when-choosing-an-ultra-low-freezer) - [Reducing Ultra-Low Freezer Service Costs – By Design](https://blog.helmerinc.com/reducing-ultra-low-freezer-service-costs) - [Ultra-low Temperature Freezers - Troubleshooting and Maintenance Tips](https://blog.helmerinc.com/ult-maintenance-tips) - [Ultra-Low Freezer Survey Explores User Needs and Purchasing Considerations](https://blog.helmerinc.com/ultra-low-freezer-survey-explores-user-needs-and-purchasing-considerations) - [How Samples Are Protected During Ultra-Low Freezer Door Openings](https://blog.helmerinc.com/protecting-samples-during-ultra-low-freezer-door-openings) ![Colleen Holtkamp](https://blog.helmerinc.com/hubfs/Blog/authors/ColleenHoltkamp.jpg) ### Written by [Colleen Holtkamp](https://blog.helmerinc.com/author/colleen-holtkamp) Helmer designs, manufactures, and markets specialized medical and laboratory equipment to customers in more than 125 countries. With an extensive background in Helmer products, Colleen’s focus is on the Clinical Laboratory and Blood Bank segments. #### Share or write a comment! 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