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Do not operate heater with a damaged cord or plug, or after heater malfunctions, or has been dropped or damaged in any manner. Discard heater, or return to authorized service facility for examination and/or repair. 11. WARNING Risk of Fire. To prevent a possible fire, do not block air intakes or exhaust in any manner. Do not use on soft surfaces, like a bed, where openings may become blocked. Heater must be kept clear of all obstructions: maintain a 3 foot minimum clearance from front and 12 inc