Arctic Hayes Classic 3g Smoke Cartridges with an easy-to-use finger grip base. Perfect for testing air filters, fume hoods, air balancing and fans, as well as for use within mandatory testing of flues, chimneys, pipe and ductwork. Each cartridge supplies approximately 5m of dense smoke for 45 seconds. Supplied in a resealable plastic pack. Complies with BS 5440-1.