15. If not installed, operated and maintained in accordance with the manufacturer’s instructions or if there is damage to or mishandling of this product’s components, use of this product could expose you to substances in the fuel or from fuel combustion which can cause death or serious illness and which are known to the State of California to cause cancer, birth defects or other reproductive harm. 16. Tumbler will not operate with the loading door open. DO NOT bypass the door safety switch to pe