Nilfisk GD5 Commercial backpack vacuum cleaner and GD10 commercial backpack vacuum cleaners H13 HEPA pleated paper filter cartridge This is the square white filter cartridge depicted above motor fan unit housing in picture.
According to EN 60335-2-69 The Terms "TYPE H" FILTRATION and HEPA FILTRATION are NOT INTERCHANGEABLE
The HEPA classification only considers the "efficiency of filtration" eg H10 H11 H12 H13 H14 U15 U17 NOT the SUITABILITY FOR USE with HAZARDOUS or COMBUSTIBLE dusts.
As they're light, maximise the saving on postage and buy some of the related parts below, such as the filterbags and a new floor tool, or other accessory.
At the moment, standard postage within Australia is capped at a maximum of $20!