Heat ducting
Hi Joe -Ditto what others have said here about Sure Marine. Factory ducting from Hunter was usually intended for Air Conditiong, so unless it was installed specifically for heating purposes, I'd be suspect. If you need help or advice with the installation, you might consider contacting Mike's Yacht Service - he lives in Mt. Vernon but spends a lot of time doing heater installations for Signature Yachts in Seattle. 360-421-1713Best,Trevor