Transom Mul
The MCN-011 Transom Mull is a professional horizontal framing member designed to separate a door from its above transom window (sidelite / fanlight). It provides structural support for the transom while creating a clean visual division line, suitable for residential, commercial, and public building entry systems.
Dimensions
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Overall Width: 1.5″ (38.10 mm)
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Main Body Thickness / Installation Height: 1.25″ (38.10 mm)
Note: Key profile dimensions shown above. Both critical dimensions are 38.10 mm, forming a near-square cross-section. Compatible with standard transom and door frame structures.
Key Features
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Designed for transom applications – Specifically for horizontal division between door and transom window
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Square profile – 1.5″ x 1.25″ near-square cross-section for stability and aesthetics
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Structural support – Firmly carries the weight of the transom window, enhancing overall door opening strength
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Visual separation – Creates a clear transition line between door and transom light
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Durable material – Resistant to warping and weathering; reliable for long-term use
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Easy installation – Can be screwed or adhered between the left and right door frame jambs
Applications
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Horizontal mull between entry doors and above transom windows
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Partition bar between interior doors and fanlights
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Decorative transom bar for commercial storefronts
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Building entrances requiring additional overhead lighting
Installation Tips
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Ensure the left and right door frame jambs are level and accurately spaced before installation
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Horizontally secure the transom mull between the two jambs
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Install the transom window frame above and the door frame below the mull
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Use sealant along joints for improved air and water tightness
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