Frequently asked questions

The EXPERT System is a FREE to use specification service for Henderson's sliding and folding door gear. It provides the user with a quotation based on the information provided, detailing the correct gear to use, prices, drawings and fixing instructions. Simply contact the Technical Sales Department for further information.

Anybody can. It's FREE to register and all new users are given their own user number which will appear on their specifications. Using the EXPERT Service is a great way to ensure that the sliding door gear you order is the correct gear for your application. For more information please contact the Technical Sales Department.

For information on your local stockists of Henderson sliding and folding door gear please go to the 'Find a Distributor' section on this site or contact our Technical Sales Department.

The most important consideration is the weight of the door. Other factors which are important are the height of the door, the number of doors required, whether the application is internal or external, is there strength in the head of the opening to carry the door weight, is there room for the doors to be parked at the side of the opening and what are the environmental circumstances i.e. is it to be used in a high use environment such as a school or hospital, will the gear be exposed to corrosive elements etc. To find out all the information that will be required to make a specification refer to the Ask an Expert section and print off the relevant Expert form.

As long as there is sufficient strength in the head of the opening to carry the door, industrial top hung sliding gear systems such as 301, 305 and 307 are the best types of systems to use. Because the operating gear is situated at the top of the door, it is clear of dirt and debris which can foul bottom rolling systems. For an accurate specification please contact our Technical Sales Department.

When there is insufficient strength in the head of the opening to carry the weight of the door. Henderson's Sterling bottom rolling systems will also carry very heavy doors - up to 8000kg in weight.

No. Henderson does not supply the actual doors themselves. We can sometimes make suggestions regarding local suppliers but as a general rule we do not supply the doors.

The standard number of hangers for a straight sliding system is two. Adding an additional hanger will not increase the allowable door weight as the weight will only ever be carried on two hangers. The number of hangers required for a folding system is determined by the number of doors to be used. Using the EXPERT Service will reveal the exact number required.

A properly specified system will not require a great deal of maintenance. Most industrial systems will require the track and hangers to be greased every six months. Commercial systems require no greasing but benefit from having the track and any guide channel cleared of obstruction and dirt build up. All systems should have their fixings checked for tightness every six months. For specific information on a particular system consult the maintenance section of this web site.