Discover the ultimate solution for detecting air currents and leakages with the Airflow Products Smoke-Stick Refill pack. Designed to emit a smooth, thin, non-volatile stream of smoke, this tool is perfect for precise airflow studies and leakage detection. With no naked flame and no ash by-product, the Smoke-Stick is both non-hazardous and environmentally friendly, ensuring safe and effective usage. Key Features: Smooth, Thin, Non-Volatile Smoke Stream: Ideal for detecting air currents and leakages Environmentally Friendly: No naked flame, no ash by-product, and non-hazardous Long-Lasting Performance: Each Smoke-Stick offers a minimum of 30 minutes of continuous smoke or 90 tests of 20 seconds each