Smoke Emitters were initially designed for HVAC or Airflow Testing but now also enjoy widespread use as special effects Smoke in Film, Television and Photography. Smoke Emitters have a longer duration than most Smoke Grenades but output less smoke volume: e.g. 1,200 cuft for S104 over 3-4 minutes and 2,500 cuft over 3-4 minutes for S105. These products must be hand-ignited and they dissolve down during combustion. Smoke Emitters are ideal for projects that require lower volume and longer duration of smoke effects. Unlike Smoke Grenades, Smoke Emitters are not classified as Dangerous Goods by Transport Canada. Therefore, they be shipped to you at a very low cost. Also, Express Air Shipping is also available for this product if your situation demands it. Smoke Emitters provide different visual effects, colouring and duration than Smoke Grenades and are suitable for a broad range of applications.