Avoid using in drafty areas, near an open window, air duct or fan. Ensure wicks are trimmed to 7mm during use and each time candle is relit. Do not burn a Glasshouse Fragrances 380g Soy Candle for less than 1 hour or more than 4 hours at a time. Stop burning when 10mm of un-melted wax remains in the bottom of the jar. Never allow the candle flame to come in contact with the side of the glass.