Black Iron NG supply line proximaty to heating/AC duct

Can Black iron NG supply run in close (1/2") parallel to a heating duct?

Yes it can.

The ignition temp of NG is above 1,100°F.

not a problem

Just can’t run inside / through ducts.

As all said; yes it can.

P.S. Welcome to our forum, John…enjoy and participate. There are no stupid questions. :smile: