Roof hatch type RHT, standard
Standard size / Weight:
RHT7090: 700 x 900 mm / 38 kg
RHT9090: 900 x 900 mm / 44 kg
RHT7014: 700 x 1400 mm / 52 kg
RHT1010: 1000 x 1000 mm / 50 kg
RHT1015: 1000 x 1500 mm / 65 kg
RHT1020: 1000 x 2000 mm / 82 kg
RHT9024: 900 x 2400 mm / 89 kg
(Longest side is hinge side)
Gorter® - completely assembled, surface mounted
- Thermal separated and insulated aluminium construction
- Counterbalancing system for assisted opening and controlled closing
- Double sealing for weather and water tightness
- Fully opened cover engages automatically, with release button
- Diagonal handrail to safely enter and leave roof hatch
- Cylinder lock (31 x 70 mm) with 3 keys, in- and outside operation, opening length > 1501 mm with 3 point lock
Performance according to CE (ETA-15/0338):
- Resistance to permanent loads (Eurocode EN 1993-1-1): 1050 kg/m²
- Sound reduction (EN-ISO140-3): 26 dB
- Watertightness (EN 12208): Class E 650
- Resistance to wind load (EN 12210): Class E 3000
- Resistance to snow loads (EN 1991-1-3): 3.97kN/m²
- Impact hard body (EN 356): Class P5A
- Impact soft body (EN 13049): Class 5
- Air permeability (EN 12207): Class 3
Standard powder coating:
Powder coated in RAL7047 (outside) and RAL9010 (inside).
Type EL- single and OL - double or triple, depending on height.
Ladder supplied in anodized aluminium. Two hooks on top to be hooked over a fixed step to safely enter and leave roof hatch. Hooks can be locked (padlock by others) to prevent ladder from misuse.
Ladder can be stored in the 2 wall suspension brackets, 1 with padlock hasps (padlock by others).
Step to be fixed (by others) into roof opening near access side
Height: ........ mm
to be specified from floor to top of roof (without insulation and covering), max 7200 mm
depending on length and type from 360 - 490 mm
Distance between rungs:
Included in supply:
- 2 Fixed hooks, one provided for padlock
- 1 Step with brackets
- 2 Suspension brackets, 1 provided for padlock
Gorter® Electrical Operation of Roof Hatches and Floor Doors
Standard Electrical operation - GT35
The Gorter GT35 electrical operation is a solution, which can be fitted on any standard Gorter RHT roof hatch or floor door of the type WA, WAPT and OP. The two powerful electric motors are always fitted as a pair on both sides of the lid. The motors are pre-fitted from the factory or can be fitted afterwards on any standard RHT roof hatch from model year 2012 and later.
- Roof hatches type RHT standard
- Hinged Floor doors type WA (flush), WAPT and OP
Operation and control 230Vac
The Gorter GT35 is a system with two motors and a control unit. As a standard the system is supplied with a compact surface mount keypad for easy operation. The keypad connected with signal cable can be installed remote from control unit. On request the system can be supplied with wireless remote control.
Control unit: 265 x 105 x 40 mm
Keypad: +/- 70 x 50 x 10 mm
Length of signal/power cable motors: 2 m
The drives and the wiring must be installed by a certified installer
Electrical operation for linking to a fire alarm systems
Depending on the access door type, the weight of the cover and the application, we can install one or more gear rack drives. These drives are available in 24 Vdc or 230 Vac.
Operation and control 230Vac
This is the simplest system with 1 motor. It can be operated with an integrated or surface-mounted switch, not included.
Operation and control 24Vdc
Operation of one or more drives is controlled by a control box with rectifier that is connected to the electricity network.
- Communication with central alarm system, possibly combined with emergency switch
- Operation control of other objects
- Control by automatic detectors - smoke, rain, wind, fire etc.
- Automatic sequence control of two covers that are overlapping
- Automatic stop in case of unequal load or overload
Depending on the features we will recommend a suitable control box type.
Emergency hatches and doors:
It is of life importance that an emergency door opens after a break down of the electrical system. For those reasons a control box can be provided with a built-in emergency power pack.
The drives and the wiring must be installed by a certified installer.
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Gorter roof hatches with ladders provide practical and safe access to flat roofs for maintenance work as well as access to cooling installations, lift machine rooms, window cleaning installations, solar collectors, and other facilities on rooftops. Roof hatches can be installed on flat roofs with a maximum slope of 30°.
Depending on the floor height, the Gorter combination of roof hatch and ladder is available with a single, double or triple extension ladder. The Gorter ladder is supplied as standard with suspension brackets for safe storage when the ladder is not in use. This combination is ideal for infrequent use of the roof hatch. For more frequent use, we recommend a roof hatch with scissor stairs or fixed staircase.
Fully thermally broken
The Gorter RHT roof hatch has a fully thermally broken curb and cover, and a proven high insulation value. This minimises the chance of condensation forming and guarantees energy cost savings.
Gorter RHT roof hatch with ladder:
- TÜV NORD & KOMO® certified and Aboma safety mark
- Ladder with Aboma and TÜV NORD quality mark
- Roof hatch safe operation with one hand
- Safe grip all the way to the roof
10-year warranty on the roof hatch, 1 year on climbing devices
- Optional electric control of roof hatch
- High-quality aluminium construction of hatch and ladder
- Euro cylinder lock with indoor and outdoor operation
- Burglar- and sound-proof roof hatch
- Wall brackets and ladder with padlock fixture to prevent unwanted removal of the ladder
- Fast delivery
Read more about the advantages of Gorter roof hatches here