Mach 8 noise reduction full kit
Product DescriptionMany people complain that the Mach 8 low profile air conditioner fitted to some RVs and travel trailers is still too loud on the outside. We performed some tests on a pair of donated Mach 8 units that had been removed from Casita travel trailers (and replaced with Mach 1 units). There are many reasons why these units are loud, but we have to limit our solution to the major items that can be addressed with the unit on the roof.
These are the problems that we can fix.
- The external fans runs too fast.
- The external fan does not change speed between hi/lo.
- The plastic exhaust grille impedes/adds turbulence to the airflow
The full report into our tests can be found here but the summary of our finding is:
Noise readings measured at 15 feet:
- Original Mach 8 with 6 blade fan: 68.9 dBA
- Mach 8 with series "D" blade fitted: 60.5 dBA
- Mach 8 as above but slowed down: 54.6 (hi) 54 (lo) dBA
- As above with new external grille. ~53 dBA
There are 3 components to our "fix":
- The speed controller. (think of it as a 'dimmer switch' for the motor)
- The Series "D" 3 blade fan.
- The replacement external grille.
The speed controller This the heart of the fix. This slows the fan down to a speed that gives the same airflow as the original 6 blade fan. It also changes the speed between hi and lo. Installing the speed controller box involves splicing 4 wires into the existing wiring harness under the A/C cover on the roof, then screwing the new box down with 2 self-tapping screws. The A/C cover is held down with 4 screws and all work can be done from the rear right corner of the roof. Installing the controller involves many dangers but we are all adults here and you are sensible enough to asses the risk for yourselves. If you are not comfortable working from a ladder on electrical connections this is not for you.
The new blade This is a major part of the noise fix - and may already be in place. Beware however that the original free replacement blade ("B" or "C" series) will crack and break up at some point. You must have a series "D" blade. Check the number on the top of the blade. 1472B504 is B series and 1472D504 is a D series. You need the D one. You can get this part for free from Airxcel - (316) 832-4357. part number = 1472D5041. If they will not send you a free one, this is the kit you need to buy. If you already have the series D blade - get the partial kit instead.
The new exhaust grille While you have the cover off - slice off the plastic grille with a box cutter and bolt this one on in its place. Custom made to reduce noise and turbulence on the outgoing air stream. White or Black powder coated grille and stainless steel hardware supplied.
Curious? Download the install instructions here Our install video can be seen here
FedEx Ground Shipping (lower 48): $19.95 USPS Shipping to Canada : approx $49 (read below then email us) Canadian Customers: Please read the FAQs page for ordering info.
Latest News 3-7-2017 Two Bits of Good News on Shock Kits! 1.) Dexter has officially stated that our shock kit does not void their warranty! 2.) We have have found a solution to the challenge of keeping standard lift kits in stock! (its a long story) So.. look for those to be back in stock very soon (like a couple of days.) ... Other Products: Looking to restock propane shelves very soon. Also, Still out of LowPro Lockdown for Yamaha EF24000 and Yamaha EF2000. We have a waiting list so please send us an email if you would like to be on it.
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