Fire-resisting inspection hole

do svislých
In vertical and horizontal structures


The frame of the inspection hole is welded from galvanized steel plate, thickness 1.5 mm.Construction of the frame is dependent on the dimension and type of the inspection hole. The inside circumference of the frame is equipped by a fire-resisting and smoke-resisting tape which stops penetration of fire and smoke through the joint between the frame and a cover. The cover is a removable part positioned in the frame and fixed by two rivets and fitted with locks (an automatic snap lock, a latch with wingknob or a FAB lock).

The front side of the cover can be sheet-metal filled with a plaster or ceramic wall tiling, veneer or HPL depending on a connected structure. A single-leaf or double-leaf inspection hole GRENA is defined as a fire shutter and functions as fire stopping.


Standard version of fire-resisting inspection hole Grena

name dimension (mm) fire resistance type of closing type of structure type (front view)
2 GrenaTur 20 1800 x 900 EI 30 / EW 90
- latch with wingknob
- FAB lock
vertical structure
surface komaxit RAL 9003
GrenaTur 20 900 x 900 EI 30 / EW 90
- latch with wingknob
- FAB lock
vertical structure
surface komaxit RAL 9003
GrenaStura 20 900 x 900 EI 90 / EW 90
- automatic snap lock
- latch with wingknob
- FAB lock
vertical structure
plasterboard, HPL,
veneer or ceramics
GrenaStura 20 S 900 x 900 EI 90 / EW 90
- latch with wingknob single-leaf
horizontal structure
Basic dimension range
(dimension of a building hole)
Sight size

Basic dimension range - building dimension is an outside size of the door frame."

Actual building hole (or rather assembly hole) must always be approx. 5 mm bigger on each side.

This area between the frame and the wall (or plasterboard structure) must be filled with fire foam or binder after fitting the frame.

Sight size of the door hole is a light access hole after opening - it is always 20 mm smaller on each side.

The doors are standard delivered as ´right´ ones (invisible hinges are on the right from the front view). It is necessary to order a non-standard placement of hinges.


300 x 300 mm 260 x 260 mm
400 x 400 mm 360 x 360 mm
500 x 500 mm 460 x 460 mm
600 x 600 mm 560 x 560 mm
700 x 700 mm 660 x 660 mm
800 x 800 mm 760 x 760 mm
900 x 900 mm 860 x 860 mm

All fire-resisting inspection holes are made on the basis of an order form thus it is possible to order any size up to 1800 x 900 mm. In case of any sizes, please, do not hesitate to consult the options with our  specialists.

Possible types and surface finishes of Grena inspection holes

Metal sheet with komaxit paint, colour tone as required

Plasterboard, possibility of plaster or paint

Ceramic wall tiling Stainless steel


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fax: +420 381 581 071
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