Measurement of a unit from the outside of the left jamb to the outside of the right jamb
When determining the Unit Dimensions Width, the following things must be considered.
- Configuration: The configuration of the unit has a huge impact on the calculation of the Unit Dimension Width. The more components that go into the configuration of the unit (i.e. doors, sidelites, jambs) the larger the unit will be.
- Construction: The way the unit is constructed will affect the way the Unit Dimension Width is calculated. A continuous unit will utilize mullposts while a boxed unit is the sum of each individual unit.
- Swing: The swing of the unit does not affect the Unit Dimension Width. Because this dimension is from jamb edge to jamb edge, it will be the same regardless if it is inswing or outswing.
Measurement of a unit from the top of the head jamb to the bottom of the sill
When determining the Unit Dimensions Height, the following things must be considered.
- Sill: Each sill has a slightly different height which factors in the calculation of the Unit Dimension Height
- Transom: A unit with a transom will have an adder for the unit dimension of the transom. Most transoms have a 13-1/2” Unit Dimension.
- Swing: The swing of the unit has a huge impact on the Unit Dimension height because of the way the door sits on the sill. For an inswing unit, the door sits on the sill cap while for an outswing unit it sits on the metal saddle. This affects the height dimension.
The Unit Dimension is related to the Rough Opening