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Always turn off power to alarm before cleaning. Using a soft brush or wand attachment to a vacuum cleaner, vacuum all sides and cover of thr alarm. Be sure all the vents are free of debris. If the alarm is false alarming and cannot be restored to normal operation, the alarm should be replaced. WEEKLY TESTING • NEVER use an open flame of any kind to test this unit. You might accidentally damage or set fire to the alarm or to your home. The built-in test switch accurately tests the unit's operatio