The installed length of my Chamberlain garage door opener
Before beginning installation, make sure you have adequate room to mount your Chamberlain garage door opener. Using the chart below, find the total length of the type of garage door opener you are installing. Then, measure outward from the header wall towards the back of the garage using the measurement obtained from the chart. The space should be free of support beams, poles, or other obstructions.
The rail length includes the U bracket except for models HD220, HD220C, PD220, PD222. These models do not have a U bracket.
See the section at the bottom of this article for rail piece lengths and for lengths of rail pieces in extension kits.
| Chain/Belt Drive Openers | Rail Length (Inches) | Length Overall (Inches) | |
|---|---|---|---|
| Single Light | Standard | 118 |
124 |
| 8 Foot | 130 |
136 | |
| 10 Foot | 154 |
166 | |
| HD220, HD220C, PD220, PD222 | 113 |
123 | |
| Dual Light (Front and Back) | Standard | 118 |
128 |
| 8 Foot | 130 |
142 | |
| 10 Foot | 154 |
166 | |
| Dual Light (Side-to-Side) | Standard | 118 |
123 |
| 8 Foot | 130 |
135 | |
| 10 Foot | 154 |
159 | |
| Screw Drive Openers | Rail Length (Inches) | Length Overall (Inches) | |
|---|---|---|---|
| Dual Light (Front and Back) | Standard | 108 |
123 |
| 8 Foot | 120 |
135 | |
Rail lengths for extension kits:
8 foot extension kit: The 8 foot extension kit is a single rail piece. A longer 37.5" rail piece replaces the header section only.
10 foot extension kit: The 10 foot extension is 2 pieces. A longer 37.5" rail piece replaces the header section and a 49.5" rail piece replaces one section of the rail.
For more information on planning for the installation of your garage door opener, see the "Preparing your garage door" and "Planning" section of the Owner's Manual.
