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Measure correctly. Choose confidently.

Doors & More Learning Center

Use clear visual guides to measure openings, understand frame depth and handing, read fire labels, and build a better order.

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Learning resource library

Measure a commercial door openingA hollow-metal door and frame with separate arrows for door width, door height, and the rough opening.Door widthDoor heightRough opening

3 min

How to measure an opening

Capture the door width, height, and rough opening without mixing up the measurements.

Measure frame throat and jamb depthA cutaway frame section showing finished wall thickness, frame throat, and overall jamb depth as different dimensions.Finished wallFrame throatOverall jamb depth

2 min

How to measure frame throat

Measure the finished wall and frame throat so the jamb depth fits the opening.

Door handing viewed from the outsideFour plan views identify left hand, right hand, left hand reverse, and right hand reverse.Stand on the outside / key sideHinge side + swing direction = handingLHLeft hingesSwings inRHRight hingesSwings inLHRLeft hingesSwings outRHRRight hingesSwings out

2 min

Door handing made simple

Use the outside/key side and the hinge position to identify LH, RH, LHR, or RHR.

Measure a commercial door openingA hollow-metal door and frame with separate arrows for door width, door height, and the rough opening.Door widthDoor heightRough opening

3 min

Door width vs. rough opening

See how nominal door size, frame opening, and rough opening relate before you order.

Measure hinge and lock preparationsA door elevation measures from the top of door to the top of each hinge cutout and from the top of door to the lock centerline.Top of door → top of hinge cutoutTop of doorto lock centerlineRecord the reference used.Do not mix edge and center.

3 min

Measure hinge and lock locations

Learn where preparation measurements start and what must match on a replacement opening.

Read a fire-door labelA door label highlights rating duration, positive-pressure listing, manufacturer identity, and the need for a complete compatible assembly.FIRE DOOR LABELRATING45 MINLISTINGPOSITIVE PRESSUREMANUFACTURER / FILE NO.Door • Frame • Glazing • HardwareLISTEDThe complete assembly and local requirements control.

3 min

Understanding fire labels

Read the opening label and keep the door, frame, and hardware assembly compatible.

Measure frame throat and jamb depthA cutaway frame section showing finished wall thickness, frame throat, and overall jamb depth as different dimensions.Finished wallFrame throatOverall jamb depth

2 min

Choosing jamb depth

Match the frame profile to the finished wall construction and measured thickness.