Spraying Systems [India] Pvt. Ltd. Offers Low Flow Air Knife. Spraying Systems [India] Pvt. Ltd. Is ISO9001:2008 and ISO14001:2004 certified company. It also offers Spray lances, Siphon indicators and spray nozzles etc. Low Flow Air Knife is used when a continuous stream of air is required or the air needs to be cycled on and off and compressed air is available compressed air. The number and length of Low Flow Air Knife to be used, air slot choice, blower size vary depending on the application.