It is not just fire that can be a major concern if your return vent is blocked. Toxic gasses are released into the air throughout the day from various appliances, but these are usually dispersed before they have time to reach harmful levels.
However, this is only possible when there is adequate ventilation. If the return vents in your home are blocked, then this ventilation is not possible and harmful gasses can build up inside your home.
Regular vent cleaning will ensure these issues do not arise, and if you notice any signs of poor air quality it is important to contact a professional immediately.

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