The burner Thornes sell will prevent any fire spreading, its a tin with 2 lids , a hook to hang the sulphur strips and holes to let the SO2 escape downward.
I wouldn't recommend doing it in a shed....tried it once and bee shed was unusable for rest of day...SO2 is nasty stuff to breath in. Do it outside and move fumigated boxes inside afterwards.
I wouldn't recommend doing it in a shed....tried it once and bee shed was unusable for rest of day...SO2 is nasty stuff to breath in. Do it outside and move fumigated boxes inside afterwards.