MaxxAir Maxxfan Plus 4000K

Last updated: November 2, 2026

MaxxAir Maxxfan Plus 4000K
3.5/5#6 of 14 in open lid RV vent fans
3.5

For owners who want strong two way airflow and a thermostat without paying for a motorized lid. Pair it with a separate cover if it has to run in rain.

  • 900 CFMAirflow
  • 10Speeds
  • NoRain cover
Check price at Amazon$253.31

Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Ten speeds in both directions move a lot of air at a moderate price
  • Thermostat switches it on and off with cabin temperature
  • Takes a Fanmate cover later if you want to run it in rain
Cons
  • Lid must be cranked shut by hand before rain
  • No remote, so you reach the ceiling keypad every time

The MaxxAir MaxxFan Plus family

Every MaxxAir MaxxFan Plus model we rank, smallest first. Ratings compare each against its own lid.

ModelAirflowRatingPrice
MaxxAir Maxxfan Plus 4002K900 CFM3.1/5$271.21
MaxxAir Maxxfan Plus 4000K (this one)900 CFM3.5/5$253.31
MaxxAir Maxxfan Plus 4500K900 CFM3.8/5$338.09

How it scores

The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its lid. How we rank explains each one.

Specifications

Model number00-04000K
Fan
Airflow900 CFM
Speeds10
Blade12 in
ReversibleYes
Lid and controls
Rain coverNo
Powered lidNo
Rain sensorNo
ThermostatYes
RemoteNo
LightNo
Fit and build
Roof thickness2 to 6.5 in
Warranty2 years

Alternatives in this lid

Compare

Compare the MaxxAir Maxxfan Plus 4000K with any other RV roof vent fan →

More from MaxxAir: every MaxxAir product ranked.