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Author Topic: Metal AC Duct Fittings?  (Read 227 times)

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Bill Shreeves

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Metal AC Duct Fittings?
« on: March 14, 2023, 10:30:01 AM »

I'm replacing my old AC with a new one as well as the duct etc.  Having a tough time finding a plastic 6x6x4 wye but plenty of galv metal.  Any thoughts on using the metal fitting under the V-Berth to branch from the 6" main flexible insulated duct?
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The only thing that always works on an old boat is the owner...

Bill Shreeves
s/v "Begnnings" 1987 Shoal Draft #333
M25XPB, Worton Creek, MD

Noah

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Re: Metal AC Duct Fittings?
« Reply #1 on: March 14, 2023, 10:54:04 AM »

I donít see a real problem using a galvanized fitting in this instance. The air going through the duct I guess is pretty dry. If you wanted to hedge your bets you could paint the fitting. I used this Rustoleum Universal Bonding primer (specifically listed to overpaint galvanized metal) to undercoat my anchor chain before painting colored chain length markings. It worked well.
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1990 hull #1014, San Diego, CA,  Fin Keel,
Standard Rig

Bill Shreeves

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Re: Metal AC Duct Fittings?
« Reply #2 on: March 14, 2023, 04:25:30 PM »

I was wondering how corrosion resistant the galv metal might be over time knowing the air would be pretty humid when the ac isn't running.
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The only thing that always works on an old boat is the owner...

Bill Shreeves
s/v "Begnnings" 1987 Shoal Draft #333
M25XPB, Worton Creek, MD

Gregory M

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Re: Metal AC Duct Fittings?
« Reply #3 on: March 14, 2023, 06:20:34 PM »

Bill, don't forget condensation! Cold air blowing through pipes/fittings, meeting warm/moist air on outside fitting. Ducts should be insulated!
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Gregory, "Luna Rossa", #1063, 1990, T.Rig Mk 1.5, fin keel. Universal M 35,  Rocna 15,
Penetanguishene ON.

Bill Shreeves

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Re: Metal AC Duct Fittings?
« Reply #4 on: March 14, 2023, 06:27:30 PM »

Bill, don't forget condensation! Cold air blowing through pipes/fittings, meeting warm/moist air on outside fitting. Ducts should be insulated!

I'll be using insulated flex duct and I intend to insulate the wye as well.
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The only thing that always works on an old boat is the owner...

Bill Shreeves
s/v "Begnnings" 1987 Shoal Draft #333
M25XPB, Worton Creek, MD

Steve McGill

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Re: Metal AC Duct Fittings?
« Reply #5 on: March 14, 2023, 07:00:02 PM »

Suremarineservice.com
« Last Edit: March 14, 2023, 07:00:54 PM by Steve McGill »
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CLARITY 1988 #588 TRWK
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MarcZ

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93 C34 Mk 1.5 #1258 TR WK M35
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Bill Shreeves

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Re: Metal AC Duct Fittings?
« Reply #7 on: March 16, 2023, 08:05:46 PM »

Thanks Marc!

Steep price but, no worries about corrosion, and this is a big plus, it includes an adjustable diverter!  Shipping was an unreasonable $32 to boot but, it's the only place that has one so, I ordered one.
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The only thing that always works on an old boat is the owner...

Bill Shreeves
s/v "Begnnings" 1987 Shoal Draft #333
M25XPB, Worton Creek, MD

Noah

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Re: Metal AC Duct Fittings?
« Reply #8 on: March 16, 2023, 09:23:52 PM »

When itís 100 degrees and humid outside this Summer, the price wonít seem so extreme. 8)
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1990 hull #1014, San Diego, CA,  Fin Keel,
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Bill Shreeves

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Re: Metal AC Duct Fittings?
« Reply #9 on: March 17, 2023, 06:07:37 AM »

Especially on the Chesapeake where it gets pretty steamy in august!
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The only thing that always works on an old boat is the owner...

Bill Shreeves
s/v "Begnnings" 1987 Shoal Draft #333
M25XPB, Worton Creek, MD
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