Forced air heating delivery question?

[Petar]

I've finally figured out and fixed my older D4L Eberspacher diesel air heater. Fuel metering pump was the culprit not being properly setup for right amount of fuel delivery causing the heater to work intermittently. It works very well and exhaust a lot of hot air as it should. Originally it was (and it still is) setup inside the port cockpit locker with heated air ducting lead along the port side of the boat with four openings. The ducting is 25 years old and somewhat dirty/dusty. I am playing with an idea to just lead one main hot air exhaust into main cabin and with the pressure the fan delivers hot air will travel to forward and aft cabins. Do all of you guys having forced air heating use ducting along the entire boat with branches to each space? Bulkhead mounted heaters with small fan fitted heat boats easily and this one has a powerful fan that blows a lot of hot air. Any thoughts? pros and Cons are welcome.

[sailjunkie]

Previous owners installed 2 or 3 ducts.

However, one of them decided to use only one duct, in the main salon on the port side. The ducting runs from the deep locker hatch to just forward of one of our coolers. It heats everything except the aft cabin quite nicely.

Changing it is not as high on my priority list as further work on the rigging and re-building the boom, plus a haul out this year. In fact, it's propane (brand name Propex) and I'll replace it with a diesel heater when it dies.