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Boilers and water heaters typically have drains to remove the excess moisture and condensation that builds up in the course of normal operation. Unfortunately, these drains can become clogged or rusted, preventing liquid from being properly removed and encouraging mold growth on the walls, floors, even the air, around the malfunctioning unit. Inspect and clean your HVAC units drains regularly to ensure that they are working properly and consider running a dehumidifier in rooms where moisture tends to collect.
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