A Boler really benefits from a power roof vent, it helps cool the interior, controls humidity and condensation, and can be useful when cooking.
Below you will find two options each with its own advantages and disadvantages.
Option 1 – DIY Power Roof Vent
- Very low current draw (great for boondocking)
- Very quiet
- Need to fabricate fan mounts to vent
- Lower air flow
This first option requires a little more work but I personally prefer it over the commercially available Power roof fans for two reasons:
- Noise – I hate the noise a fan makes, I wanted a power roof fan so quiet I could hear the silence of the forest while camping and leave it running all night and it would not disturb our while sleep.
- Power Draw – I didn’t wantto be concerned that leaving the fan on all day and night in hot weather would drain the battery
Power roof vent that is both low draw and very quiet.
I wanted a fan in the roof vent but I find the Fantastic fan is too noisy and draws way too much battery power so I decided to build my own.
Very simply I used two 140mm computer case fans, each of the fans has 2 speeds, very low current draw and are almost silent. The installation was simple, using 2 lengths of 1″ flat aluminum that is available in 8′ lengths at any hardware store I connected the fans to the strapping and then the strapping to the existing vent shroud using #8 machine screws.
The fans I used and their specifications are:
• Antec TrueQuiet 140
• Current draw – 0.04 amps on low and 0.1 amp on high
Decibels – 9.8 db on low and 20 db on high
Airflow (CFM) – 40.5 on low and 65 on high
Compared to the Fantastic fan (3 speed):
Current draw – 1.89, 2.29 and 3.0 amps on low, medium and high
Decibels – 39.0, 39.0 and 40.0 db on low, med and high
Airflow (CFM) – 478, 653 and 920 on low med and high (no comparison on airflow but remember our trailers are only 360 cu/ft total volume without cabinets)
So how does it work?
We always travel with a portable weather station which displays and records temperature and humidity both inside and outside. Without the fans the interior was always hotter and had a much higher humidity than the outside, in fact in the mornings the humidity was often in the low to mid 90% range and the windows would be fogged up.
On last weeks trip to Glacier Park we used the fans, the interior temperature and humidity stayed either equal to or lower than the outside air and no window fogging or damp walls. A huge improvement. Even with both fans on high speed they were totally quiet, we could not hear them running even during the night.
I would recommend this addition to anyone’s trailer.
Option – Fantastic Fan or Maxx Fan