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For best results fumigate in the late afternoon and leave the greenhouse for a minimum period of 2 hours. Clear people and animals including fish from the room before use. Place canister(s) spaced out on a heat resistant surface on the floor e.g. a plate on top of a sheet of 50cm x 50cm aluminium foil. IMPORTANT: THIS PRODUCT MAY EMIT SOME SPARKS UPON IGNITION. CAUTION MUST BE TAKEN WHEN LIGHTING THE PRODUCT.