Glossary

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R

Rw
An acoustic measurement denoting the “weighted average sound reduction index” and used to describe the performance of a door assembly over a range of frequencies, but expressed as a single comparable figure – eg, 29dB Rw.
Rail
A horizontal reinforcing element in a door leaf construction.
Ramp
A sloping plate used to facilitate a smooth transition from one floor level to another.
Rebate
The part of a door frame created by the presence of the stop, and forming a recess for the edges of the door leaf.
Resilience
The ability of a flexible sealing element to recover quickly from deformation caused by compression or other locally applied force.
Reveal
The side of the door frame, revealed by opening the door.
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