> How about a heat duct... > Re: heat ducts and wiring. There are code restrictions on wiring in air passages. Some insulation gives of nasty toxic smoke when heated, say like in a fire. A sad fact - many people who might have otherwise survived a fire die due to smoke inhalation. Not all wire give off toxic fumes but you can't tell what kind you have just by looking at it. Easy rule - Don't run wire in air ducts. Mark Browne