How to Size MUTO Sliding Glass Door Panels and Sidelites
Precision glass sizing is essential for flawless MUTO sliding door installations.
Key Terms & Definitions
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CW (Clear Width):
The opening between two fixed panels (sidelites) or a fixed panel and a wall. It’s NOT the opening when the door is pulled open but the finished opening when the door is closed. -
CH (Clear Height):
The finished vertical distance from floor to underside of track/header. -
DW (Door Width):
The total width of the sliding panel.-
For a single door (wall or glass mount):
DW = CW + 2-3/8" (2.375") -
For a single door with 2 fixed panels or closing against jamb:
DW = CW + 1-3/16" (1.1875") -
For a bi-parting double door (glass mount):
DW = CW ÷ 2 + 1-1/16" (1.0625"), plus 1/4" (0.250") gap between panels, for each door
DW = [CW + 0.25"] ÷ 2 + 1-1/16" (1.0625")
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GH (Glass Height):
GH = CH + 7/8" (0.875"), allows hardware clearance. -
FPW (Fixed Panel Width):
For one sidelite: FPW = RO - CW
For two sidelites: FPW1 = FPW2 = (RO - CW)/2
(RO = rough opening width) -
Overlap:
The extra width the door extends beyond CW, determined by bottom door guide and mounting type.
Panel Sizing Table (Imperial Fractions & Decimals)
| Model | Min DW (in, dec.) | Max DW (in, dec.) | Min FPW | Max FPW | Max GH | Glass Thickness | Max Panel Weight |
|---|---|---|---|---|---|---|---|
| XL 150 / XL 80 | 26" (26.000") | 57" (57.000") | 23-5/8" (23.625") | 54-5/8" (54.625") | 118" (118.000") | 5/16"-9/16" (0.3125"-0.5625") | 330 / 176 lbs |
| XL 120 SC | 33-1/2" (33.500") | 57" (57.000") | 23-5/8" (23.625") | 54-5/8" (54.625") | 118" (118.000") | 5/16"-9/16" (0.3125"-0.5625") | 264 lbs |
Example 1: Single Door and One Sidelite (Wall/Glass Mount)
RO: 108"
CW: 42"
DW = 42" + 2-3/8" = 44-3/8" (44.375")
FPW = RO - CW = 108" - 42" = 66" (66.000")
GH: If CH = 96", GH = 96" + 0.875" = 96.875"
Example 2: Bi-Parting (Double) Doors
RO: 120"
CW: 72"
Each door:
DW = [72" + 0.25"] ÷ 2 + 1-1/16" = (72.25 ÷ 2) + 1.0625 = 36.125" + 1.0625" = 37.1875" (37-3/16")
FPW1 = FPW2 = (120" - 72") ÷ 2 = 24" (24.000")
Note: For glass mount formulas, use the double door formula shown in the attached images:
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Double Door Glass Mount (XL, L):
DW = CW + 2 + 1-1/16" (27mm)
Tips for Success
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Maintain a 1/4" gap between bi-parting panels for proper clearance.
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Always check the latest dormakaba technical guide for your system and project.
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Match glass thickness across all panels.
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Strictly follow these formulas to ensure the door sits correctly in the guide and operates smoothly.
FAQs
Q1: Why must bi-parting designs include a 1/4" gap?
To avoid panel collision and ensure smooth, reliable operation per manufacturer spec.
Q2: Is it OK to mix panel thicknesses?
No; always use the same thickness for fit and durability.
Q3: What’s the maximum recommended door height?
118" (118.000") for all premium models.
Q4: Where do I find full technical details?
See the official MUTO Technical Brochure on dormakaba.com.
Disclaimer:
Always check the official technical guide for your specific model and application before fabrication or installation. GHG / SlidingHardware.com is not responsible for any errors or inaccuracies with the provided information. All measurements should be verified on site!
Conclusion
For every MUTO sliding door project, these formulas deliver accurate sizing for glass panels and sidelites. Always reference the latest manufacturer documentation before fabrication.
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