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An old vented space heatertape to seal an old register. Not the right tape - won't last.water heater well-insulated with fiberglass jacketold 70% efficient gas furnace.
Note the mastic used to seal the duct seamsWell-taped registerwater heater insulated with bubble wrap. This is not a good material to use.
An old gravity furnace in the flooran open filter slot in the return duct means a poorly working duct systemwell-insulated water heater
Ductwork under an evaporative cooler tends to rust a lota duct boot sealed with masticwell-insulated water heater pipes