Can Shower Vapor Set Off Fire Alarms

Shower vapor can set off fire alarms, especially when the detector is installed too close to the bathroom door or in a space with weak ventilation. Steam creates moisture particles that some smoke alarms may read as a nuisance condition, which is why alarm placement matters so much in bathroom-adjacent layouts. NFPA guidance specifically notes that steam from a shower can trigger nuisance alarms and recommends placing alarms at least 36 inches from the bathroom door.