(a) Gas appliances must be safe and in good repair.(b) Space heaters must be enclosed and have a screen or guard.(c) You must ensure that children do not have access to floor and wall furnace grates, steam and hot water pipes, and electric space heaters.(d) If you use a fireplace or wood-burning stove, it must be kept clean and have a screen or guard.(e) You may not use a stove to heat any part of the operation, including portable camp stoves.(f) You may not use open flame or liquid fuel heaters.