Mike Lamb Posted January 21, 2021 Report Share Posted January 21, 2021 I often see these black plugs on HVAC ducts. What are they for? Link to comment Share on other sites More sharing options...
Marc Posted January 21, 2021 Report Share Posted January 21, 2021 Inspection or sampling ports? Link to comment Share on other sites More sharing options...
Jerry Simon Posted January 21, 2021 Report Share Posted January 21, 2021 For duct cleaning. Link to comment Share on other sites More sharing options...
Bill Kibbel Posted January 21, 2021 Report Share Posted January 21, 2021 It's where they inserted the "pneumatic agitation tools". Link to comment Share on other sites More sharing options...
Mike Lamb Posted January 21, 2021 Author Report Share Posted January 21, 2021 Thanks. I should have Googled first. I thought cleaning from the registers would be easier. Link to comment Share on other sites More sharing options...
Bill Kibbel Posted January 22, 2021 Report Share Posted January 22, 2021 2 hours ago, Mike Lamb said: Thanks. I should have Googled first. I thought cleaning from the registers would be easier. They do. The holes are for inserting the tools that agitate the dirt. 1 Link to comment Share on other sites More sharing options...
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