Showing you our post reno duct cleaning process 👍 We work with Pure MD Air - they put the entire HVAC system under negative pressure. High pressure agitation cleaning tools are used to loosen and remove built up contaminates. Pure MD Air cleans the HVAC system including air handling unit, supply and return duct work , interior components, registers and replace the air filters. That’s not all. They use brush cleaning technology to make sure all debris is gone from the interior of the duct work.