Televised underground duct work they were transite pipe(which may contain asbestos) with metal connectors and elbows. Also found minimal water in plenum box under furnace which is the lowest point in the system, so we recommend to run down spouts farther out away from house to eliminate water from getting under the slab and in the duct work. Once the down spouts were extended out and ducts were dry we were able to apply our duct armor product to encapsulate the transite pipe and seal the system.