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  1. S

    Is this return plenum legit?

    Ok thanks for the info. However I thought the issue was what the pipes/cables are made of, not what they carry inside. I thought these things weren't supposed to be in the return in case of fire, they produce toxic fumes... not just because they carry electric or whatever. Thanks. Sent...
  2. S

    Is this return plenum legit?

    Interesting... are you saying that the dust is too fine for the filter? I don't see how any air could get to the blower on my setup without going through the filter. Sent from my iPhone using Tapatalk
  3. S

    Is this return plenum legit?

    I'm pretty sure it's a phone cable. I didn't get to the attic to trace it yet, but it doesn't go to the HVAC system in the basement. I'm not 100% sure what that cable is but it's been there a while judging by the dust. Also I do have a filter of course, at the end of the cold air return before...
  4. S

    Is this return plenum legit?

    Also, in the last pic... that little 'landing' on the right is the duct from the downstairs cold air return. Not sure why they put a duct there! Sent from my iPhone using Tapatalk
  5. S

    Is this return plenum legit?

    There is definitely air flow. I traced to to the return duct in the basement that it connects to. There are also two holes in that duct on the bottom covered by duct tape. So I was able to get a look inside from the bottom. The thing is, I planned on using the wall next to this area... but...
  6. S

    Is this return plenum legit?

    I'm looking for places to run Ethernet from my basement to attic. I happened to look in my cold air return upstairs and found it's just a giant empty cavity. There's pipes, drains, spray foam, electric wires and phone wires in it. I know you're not supposed to run non-plenum cabling here but...
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