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Old 03-12-2017, 03:38 AM   #1
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1981 MK1 Boat engine room louvers

Anyone find any direct replacements for the louvered vents on the side of the boat? They are 11 n 1/4 × 3 1/2 inches. 2 per side and they were glued in the recessed intake box. I've spent a couple of days already scouring the web and cannot find anything of that size. There are no flanges either. Just pops in.
Any ideas on who might carry these?
Pulling my hair out.
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Old 03-12-2017, 09:10 AM   #2
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Det-Mar 721 were a direct replacement for me.

Detmar Louvered Vents

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Old 03-12-2017, 11:27 AM   #3
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We had the same issue with our 78 MS 1. I made a template from luan plywood. This I traced onto a piece of Starboard. Two off the shelf louvers that would "fit" the template were purchased and the center of the Starboard was cut out and the louvers surface mounted. The assembly was glued in place and recessed using Lexel white adhesive caulk behind and with a bead around the outside perimeter to stop it from coming out. Worked great for about 5 years until we sold the boat and looked decent.
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Old 03-12-2017, 01:41 PM   #4
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Try and find something in stainless...
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Old 03-12-2017, 02:27 PM   #5
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Yes i saw those. They are 12 1/4 inch long. And have flanges. Thought about buying them and cutting modifying to fit.
Coincidentally i just ordered detmar tables last night for the salon with recessed holders as extra. ,
The MK1 was an odd duck it seems, a few things I've had to make as the sizes were all wrong when trying to order replacements.
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Old 03-12-2017, 10:32 PM   #6
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Boat air vents - All boating and marine industry manufacturers


Found this in my exhaustive search. List of various manufacturers of vents. Requested a custom one to be made. If they can't do it I'll be doing it like Don did with different size and cutout to fit the bigger hole.
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Old 03-13-2017, 09:02 AM   #7
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Fairly sure those vents on your boat were not the original ones. Getting something that will work with the inside vent boxes might be best you can do if they are still there. By the way there is a guy on Norfolk craigslist that is parting out a Mainship 34.
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