Measuring centre opening security doors

18 Jun 2017

Heights: measure from the top of the bottom track to the bottom of the top track and subtract 12 mm. Repeat this at 3 to 5 positions along the track so as to ensure the top and bottom track are within 3 mm of being parallel. Once you have established that there is little variation then the shortest measurement you obtain will be the height measurement. You will need to record this measurement for all the Heights. If you have a variation of more than 5 mm then you may need to install a top track. Please contact the support desk for more information.

Before we can measure the widths wefirst need to establish that there are receiving interlocks on the vertical aluminium section of the fixed glass panel. To identify this you need to understand firstly what the exact function of a receiving interlock is. A receiving interlock is designed to receive the frame interlock which is attached to the backs of both the active and non-active doors so as to doors lock at the backs as well is we may join together in the middle with the main deadlock. This also has the effect of locating the two doors at precisely the correct position when they close together before locking. Usually an interlock is just a section that will have a 3 to 4 mm opening and up to 10 to 12 mm deep that is designed to receive the frame interlock.

To measure for widths with doors that have receiving interlocks on the fixed glass panels simply measure from the outside of the receiving interlock on the right-hand side to the outside of the receiving interlock on the left-hand side and divide this measurement by two for your individual door sizes.

If your doors do not contain receiving interlocks on the fixed glass panel then it would be necessary for you to install these. There are three different size receiving interlocks. 7 mm 3 mm and flat interlocks. Identifying precisely which receiving interlock is most suitable to your doors can be assisted by some facts regarding our doors. All Seconline doors are a standard thickness of 20mm. Considering that the roller is located in the very centre of the door that it would indicate that from the centre of the top of the track where the roller will be located an additional 10 mm will be needed to allow for 50% of the door thickness. A measurement needs to be taken then from the middle of the bottom and top tracks to the very face edge of the fixed glass panel.

• If the distance from the centre of the top and bottom track to the edge of the fixed glass panel is greater than 20 mm then a 7 mm offset interlock should be selected.

• If the distance from the centre of the top and bottom track to the edge of the fixed glass panel is less than 20 mm and greater than 16 mm then a 3 mm offset interlock should be selected.

• If the distance from the centre of the top and bottom track to the edge of the fixed glass panel is less than 16 mm then a flat interlock should be selected.

When measuring the widths for centre opening sliding doors that do not have receiving interlocks and will need to have a receiving interlocks fitted then the following procedure for measuring needs to be adhered to.

For 3 mm and 7mm offset receiving interlocks measure from the back of the fixed glass panel (the glass side means to  include the aluminium and not to be mistaken for the distance in between) on the right-hand side to the back of the fixed glass panel on the left-hand side, deduct 6 mm and divide this measurement by two for the individual door sizes to be ordered. No deductions will be necessary.

For flat interlock measure from the back of the fixed glass panel on the right-hand side to the back of the fixed glass panel on the left-hand side. And 20 mm to this measurement and divide by two for the individual door sizes to be ordered. No deductions will be necessary

When ordering centre opening doors from Seconline we will provide you with the frame interlocks and the receiving H channel that goes on the non-active door that allows the active door to lock into being non-active door. 5/32 rivets are provided for you to fit these, however some trimming may be necessary for your particular application and therefore they are supplied to you unfitted.

Lock Heights: Measuring for locks it is most important that you are outside looking in.

First establish which door is going to be the active and which one is going to be the non-active. This is done again from the outside looking in. If your sliding glass door is on the right-hand side then you should have a mirror image for your active security door and it will also be on the right-hand side. This is so you can open the active glass door and open the active security door without actually having to open neither non- active door on the opposite side. This is the only combination that is possible.

Again if your active door is on the right-hand side then the lock will be on the left-hand side of the right-hand door. Some people have problems understanding this and so a good piece of advice is to simply draw two squares side-by-side on a piece of paper that would indicate the left and the right doors. Now if for instance your right-hand square is indicating that the right door is your active door then draw a simple cross on the side where you would like to have the lock installed. This should make you realise that will be on the left-hand side of the right-hand door. If the left-hand door had been chosen as the active door then you would have put a cross on the right-hand side of the left-hand door to indicate that it will be a right hand lock on the left-hand door.

Measuring the heights of the lock: First establish whether you want the lock on the security door to be above the existing glass sliding door lock or below.

For above then simply measure from top of the bottom track to the very top of the sliding glass door lock and add 125 mm.

For below the sliding glass door lock then simply measure from the top of the bottom track to the bottom existing sliding glass door lock and subtract 60 mm. In either case these two measurements will indicate your lock height.