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Old 24-07-2009, 15:05   #1
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More A/C Questions - Ductwork & Grills

I've been all over Dometic's website, and even had a cursory look through their parts manual at a local boatyard, but trying to tie part numbers to a particular sized grill and such was a bit more than I could do with a 5-minute glance at their price list. And it's not available online...

Other than going through an A/C installer, is there an online source for teak grilles, plastic transition boxes, and ductwork? I'm guessing that Dometic has to protect their distributors and dealers, keeping info close to the vest. Are there other manufacturers which are a little more open to the do-it-yourselfer?
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Old 24-07-2009, 16:09   #2
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Virtually all of the Marine AC Manufacturers offer a wide range of parts to install a system. Google "Marine Air Conditioning" and go from there (e.g. Accessories / Marine Division / Home - Mermaid Manufacturing - Home of Mermaid Marine Air Conditioning ).
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Old 24-07-2009, 16:22   #3
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Thanks!

I looked at a few of the others and gave up before I even got to Mermaid. They seem to have exactly what I needed
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Old 24-07-2009, 18:06   #4
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One thing to look for is they do make ductwork that is more allergy resistant. May not seem like a big deal but mold growth in the ducts in a marine environment can be a problem. Also running the duct work is the biggest PITA part of the job.
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Old 24-07-2009, 22:22   #5
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You may be able to find a source here (or ask here):
HVAC-Talk: Heating, Air & Refrigeration Discussion - Powered by vBulletin

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Old 25-07-2009, 04:40   #6
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HVAC Duct Size:
The airflow through a duct is limited by both velocity and pressure loss.
The faster the air moves the louder the noise.
Ideally, you’d like to size your ducting to limit air velocities to under 1,000 Feet per Minute, but in reality will usually have to settle for something between 1,000 - 1,500 FPM.
Use the friction rate value of 0.1 inch water gauge wc/100ft (29 Nm-2 or 29 Pascals) of total resistance within the duct.

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Online Residential Ductulator - EfficientComfort.net
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