Fire ventilation

Iron bar, pincers,jimmy, crowbar.Fireman’s axe.Cutting axe.Sheet metal extractor.The power cutter is a heavy-duty tool that can be fittedwith different blades, depending on what is to be cut. Usersof power cutters, in similarity with other power tools, mustbe knowledgeable of its correct usage to ensure safety andefficiency. It should be run at full speed and allowed to eatits way through the material without being forced.Different types of hand tools are iron bars, pincers, jemmies,crowbars, fireman’s axes, and cutting axes.Special toolsThe jaws of the sheet metal extractor are tensioned over thesheet metal that is to be pulled down from the roof with thechain fitted in the tool, for example a lever. This works beston low roofs. If the sheet metal is securely fastened to the roofit can be difficult to pull off from a high roof with the lever,because the torque is excessive. To simplify removal on highroofs the fixing screws in the sheet metal can be unscrewed.Explosive cutting frames are mainly used to create openingsin roofs with folded metal sheeting on tongue andgrooved boarding. The blasting frame consists of a rigidcellular plastic frame, which can be mounted together withother frames to enable the blasting of larger openings. Theframe can be carried by one person and lifted through standardroof hatches (width 0.60 m). An explosive strip of aTo right: Explosive cuttingframe. Below: Firing takesplace with a non-electricalignition system consistingof a spring percussionigniter, ignition cable(so-called Nonel®) anddetonator.80