Arctic Hayes Smoke-Sticks™ KitThe Arctic Hayes Smoke Sticks Kit is the first product on the market offering a pencil thin smoke pattern. The smoke is non corrosive and not harmful. Ideal for testing for the slightest air movement, gas spillage. Also for mandatory CO spillage checks of boiler case sills after fitting re fitting and HVAC air movement leakage checks. The Smoke Sticks Kit comes with 3 Smoke Sticks providing up to 3 hours of controllable smoke. Refill pack also