The office doors discussed in the previous blog, are quite often modified to suit a particular requirement within the proposed office refurbishment scheme. These modifications can include:
Door width of height reduction to suit a particular space available.
Grooving of the door to receive Intumescent strips or smoke seals, which will provide additional fire protection.
Vision Panels cut into the door, which can be described as a glazed opening providing vision to the other side of the door. These vision panels are quite often specified for use on doors within corridors, and for offices where all the walls are solid and the vision panels can be used to see if the room is occupied without disturbing the potential occupant.
The Vision Panel can be almost any size and shape to suit the customer’s requirements, providing the size does not weaken the door or exceed the maximum size allowed for a Fire Door. To make it easier to consider the potential vision panel sizes and designs, our supplier, Komfort Ltd, recommends a choice of nine different configurations which are shown below. The shapes vary from circular to square and rectangular. Consideration should be given to special requirements relating to doors which need to comply with the building regulations regarding the approved document ‘B’ and ‘M’ which is concerned with the visibility through doors in certain situations. These doors are generally those on escape routes sub dividing corridors or where any doors are hung to swing both ways.
The vision panels which satisfy these regulations are those ones which extend from the top to the bottom of the door, the most common being size 1524 x 152mm. This long slot panel is also is more suitable in the office environments to suit any disabled wheelchair user.
Vision Panels can be glazed in a number of ways to suit the aesthetic and fire performance requirements which are as follows:
For non-fire check doors, the glass is normally 6mm clear glass.
For half-hour fire check doors, the glass can be 6.4mm thick Georgian wired polished plate glass or a more expensive 6.4mm thick fire glass which does not have the wired appearance.
For one-hour fire check doors, 6.4mm thick Georgian wire polished plate glass is used which is secured within a special more fire retardant glazing bead.
There are a number of different ways in which the vision panel glass is held in position, but the most common method is the use of hook shaped glazing beads which are manufactured in a timber to match the door veneer.