28th July 2016

Demystifying Ironmongery #2: Our Guide to Door Closers

Demystifying Ironmongery #2: Our Guide to Door Closers

Welcome to our series on demystifying ironmongery, where we investigate different aspects of hardware choice and functionality to help you make the right architectural hardware decisions. In the second issue we investigate different types of door closers, their uses and what to consider when specifying.


Universal surface mounted overhead door closers


Product Code: DC1002


What are they?


Surface mounted overhead door closers are very versatile, with variable power to suit doors up to 100kg in weight. A universal door closer, it can accommodate three different fitting applications, as shown in Figures 1-3.


Figure 1

DC1002 Fig1


This is the most common mode of fixing, when the closer body is installed on the pull side of the door with the two part arm projecting towards you.


Figure 61

DC1002 Fig2


Figure 2 shows the second fitting application, where the closer body is fitted on the frame above the door on the push side. This mode is generally used where there is insufficient space for the closer body on the pull side of the door, for example on a glazed door where the top rail of the door is too small.


Figure 66

DC1002 Fig3


The third fitting application is when the closer body is fitted on to the push side of the door with the two part arm mounted parallel to the door using a specific bracket provided in the kit.


Points for consideration when specifying


  • There are many versions of this type of door closer available, so please ensure you check the compatibility carefully with the application on hand
  • Where people with disabilities are using doors, specific DDA requirements come into play. This is where a door must be openable using a specific amount of Newton Metres
  • Fire doors require a hold-open function – in this instance, the hold-open device must be electromagnetic and linked directly to the fire alarm as manual hold-open devices are prohibited on designated fire doors
  • For more information, please contact our sales team who can advise you further



Concealed overhead door closers


Product code: DC1003





What are they?


Concealed overhead door closers provide a very discreet closing function for doors. When the door is closed they are fully concealed and are not visible from either side of the door. When the door is open, the slide arm can be seen connecting the closer body and the slide channel. These operate in much the same way as an overhead door closer with the speed controls and variable power. Hold-open versions are also available –either manual or electromagnetic for designated fire doors. Fire door versions are available for FD30 and FD60 doors, and intumescent kits can be provided as required. We can also supply versions for both single and double action doors. The double action version is not entirely concealed due to the fact that the slide arm must be able to exit on both sides of the door leaf.


Points for consideration when specifying


  • When specifying concealed closers for fire doors, it is important to note that the FD60 version cannot be installed into a 44mm thick door leaf. When installing this type of door closer, a long router cutter is required due to the depth of the mortice required in the top of the door leaf
  • Another consideration is that the maximum opening angle of the door is approximately 120 degrees subject to the joinery detail
  • The most common mode of installation is where the closer body is installed into the door leaf with a slide channel in the frame above. It is, however, possible to reverse this so that the body is in the frame above with the slide channel in the door. With this mode, it is important that the frame section is deep enough to accommodate the closer body




Jamb mount concealed door closers


Product code: DC1004




What are they?


Jamb mounted concealed door closers are discreet, and are installed into the back edge of the door leaf with a corresponding plate on the frame.


The DC1004 has a maximum door weight capacity of 75kg, and can be used on both FD30 and FD60 fire-rated doors, for which intumescent kits are required. A free swing version is also available with an electromagnetic hold device, designed for use on designated fire doors that require a free swing function. Where the door operates as if it does not have a door closer, but in the event of fire the closing function will activate electronically and close the door so that the fire compartmentation of a given area remains intact.


Points for consideration when specifying


  • When specifying this door closer, please ensure that the stile width on the door is wide enough
  • The mortice depth into the door edge for the closer body is 175mm, which can prove an issue with certain door designs, for instance a fully glazed door, or a door with a flat panel design where the mid cross rails is relatively light. The mid cross rail would need to be at least 200mm in height to accommodate the closer body and maintain the strength in the tenon
  • Another consideration would be usage with concealed hinges. Only specific hinges will operate with this type of closer, so please ensure you check the compatibility with our sales staff
  • Finally, this type of door closer will only work on single action doors and cannot be used with pivots




Floor spring door closers


Product code: DC1006  




What are they?


Double action floor springs are probably the most discreet form of door closer available, where the main mechanism is installed down into the floor below the door itself. The door is then pivoted from the top and bottom. The floor spring is a very heavy duty form of door closer and can accommodate doors up to 1500mm in width and 300kg in weight. They are common in high usage areas such as hospitals and schools but have a definite place in the high end residential environment. Specific options are available where the closer mechanism can be fitted below the finished floor covering – in this format the closer is completely concealed from sight, giving an extremely minimal finish.


Points for consideration when specifying


  • There are some instances where floor springs may not be the best option, for instance installation into an existing floor where underfloor heating pipes are run, or where the screed depth is not sufficient and cutting into the main floor structure may weaken the floor
  • Care must also be taken when specifying on narrow door leaves – we would not recommend the use of floor springs on doors narrower than 650mm in width. This is simply because the spring mechanism is too strong for the width of door







Demystifying Ironmongery #2: Our Guide to Door Closers

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