How to Find a Reliable HVAC Contractor for Your Home
Thursday, 21 January 2021
Black plugs on HVAC ducts?
I often see these black plugs on HVAC ducts. What are they for?
source
https://www.inspectorsjournal.com/topic/18814-black-plugs-on-hvac-ducts/?do=findComment&comment=172213
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