---
title: What is a transom?
description: A transom is an upgrade that can be decorative or operable for more air flow.
---

[Skip to content](https://help.bcgreenhouses.com/en/knowledge/what-is-a-transom#main-content)

English

Show submenu for translations

![bcg-ftr-logo](https://help.bcgreenhouses.com/hs-fs/hubfs/bcg-ftr-logo.png?width=253&height=51&name=bcg-ftr-logo.png)

- [Greenhouses](https://www.bcgreenhouses.com/greenhouses/)
- [Buying Tips](https://www.bcgreenhouses.com/greenhouse-buying-tips/)
- [Instant Pricing](https://www.bcgreenhouses.com/design-your-own/)
- [Supply Shop](https://www.bcgreenhouses.com/shop/)

Open main navigation

Close main navigation

- [Greenhouses](https://www.bcgreenhouses.com/greenhouses/)
- [Buying Tips](https://www.bcgreenhouses.com/greenhouse-buying-tips/)
- [Instant Pricing](https://www.bcgreenhouses.com/design-your-own/)
- [Supply Shop](https://www.bcgreenhouses.com/shop/)
- English
  
  Show submenu for translations
- BCGreenhouses.com

 BCGreenhouses.com

 Nice to see you! How can we help today?

- There are no suggestions because the search field is empty.

1. [Help Center](https://help.bcgreenhouses.com/en/knowledge?hsLang=en)
2. [Getting Started](https://help.bcgreenhouses.com/en/knowledge/getting-started?hsLang=en)
3. [Parts of a Greenhouse](https://help.bcgreenhouses.com/en/knowledge/getting-started?hsLang=en#parts-of-a-greenhouse)

# What is a transom?

## A transom is an upgrade that can be decorative or operable for more air flow.

A transom is typically a horizontal crossbar in a window, over a door, or between a door and a window or fanlight above it. Fixed or operable transoms are an option for upgraded greenhouses with single piece glass.

![Pressure Cap, Gutter and Transom Trim](https://help.bcgreenhouses.com/hs-fs/hubfs/Pressure%20Cap%2c%20Gutter%20and%20Transom%20Trim.jpg?width=688&height=461&name=Pressure%20Cap%2c%20Gutter%20and%20Transom%20Trim.jpg)

 

- [Getting Started](https://help.bcgreenhouses.com/en/knowledge/getting-started?hsLang=en#main-content)

    - [Greenhouse Design](https://help.bcgreenhouses.com/en/knowledge/getting-started?hsLang=en#greenhouse-design)
    - [First Steps to Buying a Greenhouse](https://help.bcgreenhouses.com/en/knowledge/getting-started?hsLang=en#first-steps-to-buying-a-greenhouse)
    - [Parts of a Greenhouse](https://help.bcgreenhouses.com/en/knowledge/getting-started?hsLang=en#parts-of-a-greenhouse)
- [Ordering Your Greenhouse](https://help.bcgreenhouses.com/en/knowledge/ordering-your-greenhouse?hsLang=en#main-content)

    - [Frequently Asked Questions](https://help.bcgreenhouses.com/en/knowledge/ordering-your-greenhouse?hsLang=en#frequently-asked-questions)
    - [Permit Information](https://help.bcgreenhouses.com/en/knowledge/ordering-your-greenhouse?hsLang=en#permit-information)
    - [Engineering Your Greenhouse](https://help.bcgreenhouses.com/en/knowledge/ordering-your-greenhouse?hsLang=en#engineering-your-greenhouse)
- [Shipping And Delivery Information](https://help.bcgreenhouses.com/en/knowledge/shipping-and-delivery-information?hsLang=en#main-content)

    - [Shipping Details](https://help.bcgreenhouses.com/en/knowledge/shipping-and-delivery-information?hsLang=en#shipping-details)
    - [Delivery Details](https://help.bcgreenhouses.com/en/knowledge/shipping-and-delivery-information?hsLang=en#delivery-details)
- [Installation Information](https://help.bcgreenhouses.com/en/knowledge/installation-information?hsLang=en#main-content)

    - [Installation Manual](https://help.bcgreenhouses.com/en/knowledge/installation-information?hsLang=en#installation-manual)
    - [Installation Tips](https://help.bcgreenhouses.com/en/knowledge/installation-information?hsLang=en#installation-tips)
- [Technical Support](https://help.bcgreenhouses.com/en/knowledge/technical-support?hsLang=en#main-content)

    - [Getting Help](https://help.bcgreenhouses.com/en/knowledge/technical-support?hsLang=en#getting-help)
    - [Frequently Asked Questions](https://help.bcgreenhouses.com/en/knowledge/technical-support?hsLang=en#frequently-asked-questions)
    - [Tips to Install and Maintain Your Greenhouse](https://help.bcgreenhouses.com/en/knowledge/technical-support?hsLang=en#tips-to-install-and-maintain-your-greenhouse)
- [Greenhouse Foundation Tips](https://help.bcgreenhouses.com/en/knowledge/greenhouse-foundation-tips?hsLang=en)
- [Greenhouse Growing Tips](https://help.bcgreenhouses.com/en/knowledge/greenhouse-growing-tips?hsLang=en#main-content)

    - [Winter Gardening](https://help.bcgreenhouses.com/en/knowledge/greenhouse-growing-tips?hsLang=en#winter-gardening)
    - [Growing Tips](https://help.bcgreenhouses.com/en/knowledge/greenhouse-growing-tips?hsLang=en#growing-tips)
- [BC Greenhouse Online Accessories Shop](https://help.bcgreenhouses.com/en/knowledge/bc-greenhouse-online-accessories-shop?hsLang=en#main-content)

    - [FAQs](https://help.bcgreenhouses.com/en/knowledge/bc-greenhouse-online-accessories-shop?hsLang=en#faqs)
    - [Online Store Returns](https://help.bcgreenhouses.com/en/knowledge/bc-greenhouse-online-accessories-shop?hsLang=en#online-store-returns)
    - [Online Store Shipping Options](https://help.bcgreenhouses.com/en/knowledge/bc-greenhouse-online-accessories-shop?hsLang=en#online-store-shipping-options)

[![Chill listening crop-3](https://help.bcgreenhouses.com/hs-fs/hubfs/bcgh-logo-icon-green.png?width=25&height=25&name=bcgh-logo-icon-green.png "Chill listening crop-3")](https://www.bcgreenhouses.com/)

BC Greenhouse Builders is a family owned and operated greenhouse manufacturing business founded in 1951. The business continues to grow offering an impressive variety of hobby and commercial greenhouses as well as spectacular estate greenhouses. The one constant in over 70 years in business is our commitment to customer service and a premium quality product.

<https://www.facebook.com/BCGreenhouseBuilders/> <https://www.instagram.com/bc_greenhouses/?hl=en> <https://www.youtube.com/user/BCGreenhouseBuilders> <https://www.linkedin.com/company/2257418/admin/>

Copyright © 2026, BC Greenhouse Builders Ltd.