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Fire resistant lifting and sliding flaps

The security assured by Novoferm fire resistant flaps is designed practically to satisfy special requirements, especially in material flow processes. The flaps can lift or slide, depending on workflows and space constraints. Both types can be designed to remain open (and close in the event of fire) or closed (and open when goods pass through).

Versatile options for installation in ground-level openings or openings with parapets enhance flexibility and offer a wide range of seal designs – even for belts running at height.

Fire resistant lifting and sliding flaps: the details

Technical description

Applications and approval
As part of belt operated conveyor systems, fireproof as per DIN 4102, building code approved and quality controlled.

Term:
These fire seals are self closing and designed to prevent fire penetrating through wall openings.

They may be used:

as seals that are designed to stay open at all times and only to close in the event of fire
as seals that are designed to stay closed at all times and only to open electrically to let goods pass through

Installation of these seals must comply with the approval certification. Careful preliminary planning is therefore crucial.

Requirements that must be met include the following:

Masonry walls as per DIN 1053, class 12, mortar group II, ≥ 240 mm thick, concrete as per DIN 1045, class B15, ≥ 140 mm thick, foam mortar blocks or precision blocks as per DIN 4165, strength class ≥ PB4/PP4, 240 mm thick or reinforced horizontal or vertical foam mortar slabs as per DIN 4165, strength class ≥ P 4.4, 175 mm thick.
Conveyor belt cutout near the flaps.
Engineering design of the conveyor belt must ensure that changes to the tracks and guides (labyrinth seals) are not needed.
All seals must be fitted with approved hold open systems.
Suitable measures must ensure that – when the smoke detectors are triggered – the open area of the seals is cleared or kept clear of moving goods. The seal closing procedure must not be hindered by goods and the closed seals must not be damaged by moving goods.
The control of the conveyor system must ensure that new goods can only be moved towards the fire seal once the area itself and the storage area behind the seal are free. This so-called safety distance necessitates a solution for monitoring the conveyor system.
A signal must be transmitted to the conveyor system when the smoke switch system is activated by smoke/fire or triggered manually. This must ensure that no new goods can move into the seal area. Any goods on the belt must be cleared immediately from the seal area – by emergency generator. Closure of the seal is triggered by the conveyor system signalling that all is clear. A further signal from the system must ensure that further conveyance is only possible when the seal is open.

Approved variant / Special equipment

Electrical operator

Required for all flaps designed to remain closed at all times and only to open for each passage.
Recommended as an optional fixture on flaps that are designed to remain open but with poor accessibility, in order to prevent draughts, reduce noise levels, etc.
Seals without operators must be opened manually each time they close.

Special testing procedures
Fire seals for conveyor belts can only prevent fire penetration if they are fully functional at all times. This must be assured by testing the seals after installation and inspecting them at regular intervals.

Acceptance testing procedure:
Once installation of the seals at their final location has been completed and they are ready for operation, their flawless functional reliability must be tested in conjunction with the hold open system and the conveyor belt by an expert from Verband der Sachversicherer e.V. (Association of Property Insurers), Cologne. A record must be kept of the final acceptance test and submitted to the construction supervisory authority for filing.

Regular inspection of the system:
The operator must check the system once a month to ensure it is fit for operation. The operator is, moreover, obligated to perform or arrange for annual inspection to ensure faultless operation of the seal in conjunction with the conveyor belt and hold open system. These inspections must be performed by a certified expert. The results must be recorded in the inspection log.

Note:

T90 lifting and sliding flaps may also be used as fire seals outside of belt operated conveyor systems.

In this case, a hold open system is not necessary but can be installed on request.

The requirements governing the use of hold open systems on such seals are the same as for sliding fire doors.

Technical data: Fire resistant lifting and sliding flaps

T90 FBH fire resistant lifting flap

T90 FBS fire resistant sliding flap

T90 FBH fire resistant lifting flap

	T90 FBH (lifting flap)	T90 FBS (sliding flap)
Characteristics
1 leaf	•	•
Also as part of belt operated conveyor systems	º	º
With hold open system	º	º
Designed to remain open	º	º
Designed to remain closed	º	º
Approval	Nr. Z-6.6-1270	Nr. Z-6.6-1247

Description
Approved dimensions (LD)	from 700 x 700 to 2500 x 2500	from 700 x 700 to 2500 x 2500
Leaf thickness	approx. 67	approx. 67
Unit weight	approx. 50 kg/m²	approx. 50 kg/m²

Overlaps The door leaf must overlap the clear passage opening:
• At each side	≥ 200	–
• At the header	≥ 200	≥ 90
• At the parapet	≥ 150	≥ 150
• At the closing edge	–	≥ 200
• At the opposite edge	–	≥ 200

Minimum wall thicknesses:
• Masonry	≥ 240	≥ 240
• Concrete	≥ 140	≥ 140
• Foam mortar / precision blocks	≥ 240	> 240
• Reinforced horizontal or vertical foam mortar slabs	≥ 175	≥ 175

Key:

All sizes in mm	LD = Clear passage dimensions	OKF = Upper edge of finished floor
• Standard	º Optional	– Not possible
*Min. distance of conveyor belts 100 mm
*Note: The upper horizontal smoke seal protrudes about 30 mm into the clear passage opening
** Storage area of open flap from lower edge of header
- With parapet: Clear passage height +850
- Without parapet: Clear passage height +700