---
title: How long can my main plenum and supply runs be?
description: The main plenum should be run as far as possible to keep supply runs as short as possible. The supply runs may be virtually as long...
---
[Skip to content](https://helpcenter.unicosystem.com/knowledge/how-long-can-my-main-plenum-and-supply-runs-be#main-content)
English
Show submenu for translations
![Unico-logo-4c.png\]](https://helpcenter.unicosystem.com/hs-fs/hubfs/Unico-logo-4c.png?height=40&name=Unico-logo-4c.png)
- [Default HubSpot Blog](https://theoutlet.unicosystem.com/blog)
Open main navigation
Close main navigation
- [Default HubSpot Blog](https://theoutlet.unicosystem.com/blog)
- English
Show submenu for translations
- Go to www.unicosystem.com
Go to www.unicosystem.com
Hello. How can we help you?
- There are no suggestions because the search field is empty.
1. [Unico Help Center & Resources](https://helpcenter.unicosystem.com/knowledge?hsLang=en)
2. [Frequently Asked Questions](https://helpcenter.unicosystem.com/knowledge/frequently-asked-questions?hsLang=en)
3. [Homeowner FAQs](https://helpcenter.unicosystem.com/knowledge/frequently-asked-questions?hsLang=en#homeowner-faqs)
# How long can my main plenum and supply runs be?
The main plenum should be run as far as possible to keep supply runs as short as possible. The supply runs may be virtually as long as you need them to be. However, there will be reduced heating and cooling capacity in runs longer than 10 feet.
- [Frequently Asked Questions](https://helpcenter.unicosystem.com/knowledge/frequently-asked-questions?hsLang=en#main-content)
- [Homeowner FAQs](https://helpcenter.unicosystem.com/knowledge/frequently-asked-questions?hsLang=en#homeowner-faqs)
- [Professional FAQs](https://helpcenter.unicosystem.com/knowledge/frequently-asked-questions?hsLang=en#professional-faqs)
- [Technical Specifications](https://helpcenter.unicosystem.com/knowledge/technical-specifications?hsLang=en#main-content)
- [10 - General Information](https://helpcenter.unicosystem.com/knowledge/technical-specifications?hsLang=en#10-general-information)
- [20 - Engineering Specifications](https://helpcenter.unicosystem.com/knowledge/technical-specifications?hsLang=en#20-engineering-specifications)
- [30 - Installation & Maintenance](https://helpcenter.unicosystem.com/knowledge/technical-specifications?hsLang=en#30-installation-maintenance)
- [40 - Application & Sizing](https://helpcenter.unicosystem.com/knowledge/technical-specifications?hsLang=en#40-application-sizing)
- [Technical Notes](https://helpcenter.unicosystem.com/knowledge/technical-specifications?hsLang=en#technical-notes)
- [Replacement Guides](https://helpcenter.unicosystem.com/knowledge/replacement-guides?hsLang=en)
- [Drawings & Submittals](https://helpcenter.unicosystem.com/knowledge/drawings-submittals?hsLang=en#main-content)
- [Blower Modules (1 - 5 ton)](https://helpcenter.unicosystem.com/knowledge/drawings-submittals?hsLang=en#blower-modules-1-5-ton)
- [Coil Modules (1 - 5 ton)](https://helpcenter.unicosystem.com/knowledge/drawings-submittals?hsLang=en#coil-modules-1-5-ton)
- [Vertical Up Flow FCU](https://helpcenter.unicosystem.com/knowledge/drawings-submittals?hsLang=en#vertical-up-flow-fcu)
- [Accessories](https://helpcenter.unicosystem.com/knowledge/drawings-submittals?hsLang=en#accessories)
- [Obsolete Parts](https://helpcenter.unicosystem.com/knowledge/obsolete-parts?hsLang=en#main-content)
- [Discontinued Parts Bulletins](https://helpcenter.unicosystem.com/knowledge/obsolete-parts?hsLang=en#discontinued-parts-bulletins)
- [Discontinued Parts Drawings & Submittals](https://helpcenter.unicosystem.com/knowledge/obsolete-parts?hsLang=en#discontinued-parts-drawings-submittals)
- [Videos](https://helpcenter.unicosystem.com/knowledge/videos?hsLang=en#main-content)
- [Why Choose a Unico System](https://helpcenter.unicosystem.com/knowledge/videos?hsLang=en#why-choose-a-unico-system)
- [Installation](https://helpcenter.unicosystem.com/knowledge/videos?hsLang=en#installation)
- [Product](https://helpcenter.unicosystem.com/knowledge/videos?hsLang=en#product)
- [UnicoSales App Help](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#main-content)
- [How the UnicoSales App Works](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#how-the-unicosales-app-works)
- [Setup Questions](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#setup-questions)
- [General FAQ's](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#general-faqs)
- [Contractors](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#contractors)
- [Distributors](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#distributors)
- [Rep Companies](https://helpcenter.unicosystem.com/knowledge/unicosales-app-help?hsLang=en#rep-companies)
- [Default HubSpot Blog](https://theoutlet.unicosystem.com/blog)
[](https://www.unicosystem.com)
Help Center
Copyright © 2026, Unico Inc.