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Post by braders on Oct 16, 2019 19:43:29 GMT
It has fan blades which look like little scoops, quite a powerful little fan - does the job well !
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Post by Mistroma on Oct 19, 2019 7:16:34 GMT
The Attwood Turbo 4000 is a straight swap for the Rule 240. I fitted one to my 42DS yesterday.
Specs. are: Voltage 13.6V Open flow rate 230 CFM In-system flow rate 125 CFM Current draw 2.9A
N.B. The in-system flow rate is measured with 3 feet of ducting, one 90 degree bend, a collector box and a vlouvered vent on discharge side of the fan.
It doesn't seem to be any noisier than the original Rule 240. I wasn't going to bother fitting a replacement this year but a local shop had one for 21.50 Euro. My wife had commented on smell from the engine after the fan failed but it wasn't a big deal.
I don't think it is quite as powerful as the Rule as that had a higher current draw of around 4.3A. I saw a spec. for flow around 237 CFM but don't know how that was measured.
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Post by Mistroma on Oct 19, 2019 7:52:08 GMT
If you had a gas motor vs diesel, the exhaust fan would be very important. As noted from a diesel standpoint, not needed. I can see on a warm summer day you could keep cabin cooler. In winter, that heat is kinda nice! For what it's worth, my boat has never had an exhaust fan for the engine compartment. Marty Yes it is only a safety issue with petrol or gas (I mean LPG, not petrol) engines. Our problem is getting rid of the heat when the temp. is around 40 degrees C. I try to avoid motoring late in the day and open the engine hatch for a couple of hours at anchor. At least that lets me stop the aft cabin temperature increasing overnight. Much more effective to cool the engine that way than running a fan, just natural ventilation. The fan only operates when the engine is running.
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Post by snwl on Oct 19, 2019 8:48:46 GMT
The fan on my boat works even without the engine running. When I reach the anchorage, I leave the engine energized and when the sensor senses an elevated temperature in the engine compartment it automatically lights up. So I leave the engine live for another hour and when the fan is running only every 15 or 20 minutes I turn off the engine.
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Post by NZL50505 on Oct 22, 2019 3:11:48 GMT
The Attwood Turbo 4000 is a straight swap for the Rule 240. I fitted one to my 42DS yesterday. It doesn't seem to be any noisier than the original Rule 240.
Mmmm. That's a shame. Because I think the one I currently have is v noisy and I was going from an earlier post here that said the Attwood turbo is very quiet.
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Post by NZL50505 on Oct 24, 2019 22:36:05 GMT
Just checked and my current noisy blower is a 4” Rule 240. Can anyone confirm they have changed from a Rule to an Atwood (or other make) and noticed it is much quieter?
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Post by sitara on Oct 25, 2019 0:18:33 GMT
I changed from a Rule that had become noisy to a new Rule and found that the new fan was much quieter than the old one. I also use a settable thermostat so it only comes on when the engine box is warm.
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Post by sailbleu on Oct 25, 2019 7:45:27 GMT
If and when you find the fan too noisy you can reduce the RPM's with this : www.aliexpress.com/item/32859971089.html?spm=a2g0s.9042311.0.0.27424c4drj5G8aBringing down the revs with a PWM-controller ( pulse width modulation) will also get the evacuation capacity down , but this way you could find a compromise between cooling the engine room and the disturbing sound it makes . I've used a fan with controller to fine tune ( sufficient airflow but low noise) the fresh air into the back bedroom as on our boat this space is fairly enclosed . Worked great . Recently replaced it with a dedicated small airco though . The controller has a plug ( screw) and play connection . Regards
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