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Mach 8 noise reduction full kit
Mach 8 noise reduction full kit
Mach 8 noise reduction full kit
Item#: Mach8_noise_kit_with_fan
Availability: Usually ships the next business day
$144.95, 2/$274.95, 3/$389.95
Grille color: 

Product Description
Many 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
Speed control box

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
Series D 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
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 5-15-2017: Wow. If you have noticed that the item you want is out of stock, it's because we are selling things as fast as we can make them! That said. Hitches are back in stock. Lowpros for Honda are in stock. A new full load of shocks will be on hand within a couple of weeks. The waitlist cleaned out our Over tank platforms but more are ordered. NOTE: If you email or call us you may get slow answers from us. We are sorry! We have hired a person to answer messages but they need to be trained on our products first ... so help is on the way!

More info on our facebook page.