Our Winnebago Micro Minnie 1800bh had the worst bathroom vent fans. I believe its not just ours and many manufactures do the same to cut the cost. The fans were tiny, loud, single speed and one direction. The covers were the simple open and close that did not allow you to use these in rainy weather. After much research we finally upgraded ours to the Maxx Air 00-07500K MaxxFan Deluxe with Remote – Smoke. From our research these are the best ones out there and the only way to go if you have the room to install as it protrudes longer towards the rear. They are slim when closed and can be used when raining. The fan spans across the entire opening with 10 speeds and can intake or exhaust air. Both the blades and the cover are translucent allowing additional light to penetrate during the days.
DIY Instructions
Parts & Tools Needed:
- Maxx Air 00-07500K
- Butyl Dior 3/4″ tape
- Dicor Lap Sealant
- Rubbing Alcohol
- Plastic Knife
- Drill or screw driver
- Close end crimp
- Crimper or pliers
Slowly start peeling back the dicor lap sealant and using the plastic blades to help ensure you dont cut the TPO roofing. It takes quite a bit of patience. You can use a dab of rubbing alcohol to do a final wipe down.
Our 2021-A Winnebago Micro Minnie 1800bh had a pipe vent that was located right next to the air vent. We thought it would clear but turns out that the vent hood would not fully close properly. We needed about an inch to clear.
We started to peel back the dicor and noticed that there was just about an inch of wiggle room. We reposition the pipe slightly over just enough for the Maxx Air Vent to clear.
Once the everything was aligned, we started to put the Butyl tape around the shroud and installed the 16 stainless screws provided with the Maxx Air fan.
After installing the shroud, you can attach the unit and the cover with 4 stainless screws 2 on the left and 2 on the right.
Connect the power to the original fan power tap and use the closed end connectors to a secure contact. Ensure you have the correct positive and negative as this may vary from manufactures. Tuck the wires into the ceiling cavity.
Preparing for the new interior trim. I measured approx 6 inches knowing that it needs to be a bit longer to tuck into the slot for a clean install.
Mark a line and trim the required depth. Mine ended up to be slightly shy of 6 inches. I think 6″ would have been fine as well.
Once the top has been trimmed the interior trim can slide back in. I had to create new holes and install the remaining 4 white screws for the interior trim.
Apply a generous amount of self leveling lap sealant around the shroud and the vent and let it sure. Note that in the next few days the TPO roof will bubble up from the chemical reactions where the lap sealant was applied. This appears to be a normal reaction. After 2 weeks the bubbles will disappear and return back to normal.