452H.SP28 Surface Overhead Door Holder
MPN: 452H.SP28
Finishes: SP28 Silver
from stock - next working day wherever possible
452H.SP28
Surface Overhead Door Holder - Hold Open Version for Door Openings 585mm - 686mm (Jamb to Jamb). Silver
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Holding the door open at a pre-determined position for long or short periods. The hold open function is an automatic mechanism that ‘kicks-in’ when the door is opened to a preset angle. Tension is adjusted using an Allen key.
- Dead-Stop Templating is recommended for applications where a wall or similar obstruction is in place at an opening angle of 110º or less (i.e., doors that open back-to-back). Dead-Stop Templating can be applied to Hold-Open, Stop-Only and Friction models. The Dead-Stop position is the point at which the shock-absorbing spring is fully compressed. Therefore, when Dead-Stop Templating is used, the initial degree of opening will be 5º to 7º less than the Dead-Stop opening. Example: If the holder is templated to a 100º dead stop, the door will hold open at an angle between 93º and 95º but no further than 100º
- 450 series models require minimal door and frame preparation. They may be used in conjunction with most surface applied door closers. In some cases, optional drop brackets may need to be mounted on the closers. These brackets are available from Relcross for LCN parallel arm models
- A heavy-duty holder or stop should be considered when doors and frames are subject to heavy, frequent use. Also, heavy-duty units should be considered on exterior doors subject to wind
- An additional option on the 450 Series is the Angle Jamb Bracket for hinge-side or flush transom mounting. The angle jamb bracket affixes to the standard jamb bracket. If ordered with the overhead holder add suffix J. If needed separately order 450J - Finish
| Concealed Mounting | Surface Mounting | ||||
| Size | Door Opening | 410 Series | 450 Series | 70 Series | 79 Series |
| 1 | 457 - 584mm | 411 | 451 | - | - |
| 2 | 585 - 686mm | 412 | 452 | 702 | 792 |
| 3 | 687 - 838mm | 413 | 453 | 703 | 793 |
| 4 | 839 - 991mm | 414 | 454 | 704 | 794 |
| 5 | 992 - 1143mm | 415 | 455 | 705 | 795 |
| 6 | 1144 - 1372mm | - | - | 706 | 796 |
Best suited to standard (medium) duty situations on internal doors where door/frame protection is important.
The 450 series offers the industry’s widest variety of functions, base materials and finishes to fit all standard (medium) to light duty applications. The perfect combination of form and function. These versatile models can be used with almost all surface overhead door closers . Templates provide variable mounting positions allowing hold open and stop positions between 85° and 100°. 450 series holders and stops accommodate doors hung with conventional full mortice hinges, offset and centre hung pivot sets.
