Duct protection

The applications with boards Grenamat AL - protection of sheet A/C piping and self-carrying A/C piping - were certified on basic of tests realised acc. ČSN EN 1366-1.

In the case of a typical duct, bilateral, trilateral, larger dimensions, please contact our specialists for fire-resistant and non-combustible Grenamat boards.
References >>



Sheet A/C piping by boards

Self-carrying A/C piping from boards

Vzduch, plech potrubí potrubí
1. Stuck joint Grena Klebepaste
2. Distance washer, seam cover Grenamat AL >= flange height, width 100 mm
3. Sheet piping flange
4. Hinging rods
5. Seam covering, Grenamat AL 100x10 mm
6. Load-carrying profiles "U", "L", "omega"
7. Self-cutting screws or steel clamps


Table of board thickness for required fire resistance

Fire resistance
Min. Grenamat AL board thickness (mm) Max. clearence (mm) Steel clamps with min. pitch 100 mm Self-cutting screws with min. pitch 200 mm Board weight
Hinged rods (dimension to 6 N/mm2)
EI 30 25 1250 x 1000 60 / 12 mm 4 x 50 14,00 M 6 ... 18,09 kg
EI 45 30 1250 x 1000 60 / 12 mm 4 x 50 19,50 M 8 ... 32,94 kg
EI 60 40 1250 x 1000 75 / 12 mm 5 x 80 22,00 M 10 ... 52,20 kg
EI 90 48 1250 x 1000 80 / 12 mm 5 x 80 23,00 M 12 ... 75,87 kg
EI 120 55 1250 x 1000 90 / 12 mm 5 x 80 30,80 M 14 ... 103,50 kg
            M 16 ... 141,30 kg
  • Determined thickness for required fire resistance are the same both for plating of sheet A/C piping, or for self-carrying A/C piping.
  • All stated parameters are the same both for supposed fire inside the A/C piping, and for supposed fire from outside of the A/C piping. If you require only one parameter (a fire inside or outside), please contact our specialists for specify thickness of material. 
  • All values apply both for vertical and horizontal A/C piping.
  • For vertical piping the values apply for a number of floors, if the distance between the supporting structures does not exceed the 5m.

The self-carrying A/C piping features seams covered by glue Grena Klebepaste and covered by plates from boards Grenamat AL, thickness 10 mm, width 100mm. The plating of sheet piping does not require the seam gluing; the internal covering of seams is made by distance washers.

Load-carrying profiles at distance of max. 1250 mm; fixing of hinging rod max. 50 mm from plating side.
The dimension of load-carrying profiles of "U", "L" or "omega" is determined acc. t static calculation. The thickness of distance washers inserted between the actual sheet piping and plating from boards Grenamat AL is determined acc. to height of sheet joint flange. The washer thickness is >= flange height.

Based on your requirement we are able to calculate the dimension of the carrying profiles. Do not also hesitate to ask for a price quotation of these profiles,  we supply several companies.

tel.: +420 381 549 111
fax: +420 381 581 071
e-mail: grena@grena.cz
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