Unvented gas heaters are used by farmers to ensure adequate heat to their poultry and livestock especially with newborn and young livestock. Some heaters may include vented and unvented infrared tube heaters, unvented direct-fired box heaters and unvented infrared brooder heaters, certified to the CSA 2.20 brooder standard. Moisture, ammonia and carbon dioxide gases created by the animals must be kept within acceptable levels and in order to achieve this, require adequate ven