FumeOut Battery Box Fan - Automatically ventilates your battery compartment, removes dangerous battery fumes
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Battery Box Vent Fan - Exhausts compartment of explosive hydrogen gas

Puts battery fumes where they belong - OUTDOORS!

Automatically ventilates your battery box - Keeps it free of fumes produced during battery recharging or equalization - Ideal for batteries charged by solar, wind, hydro, generator or AC mains...virtually any application where fumes from lead-acid batteries are a safety concern.


For 12, 24 or 48 Volt Systems
Works with all common battery voltages.
Fully Automatic Operation
Fan runs only when needed - Conserves battery power, minimizes Fan wear.
Warns you if the Fan stops running, or fails to start.
When enabled, runs the Fan for a few minutes every 24 hours to purge fumes in between battery recharge intervals.
Set your own Fan turn-on and turn-off voltages, or use the factory-calibrated default values.
Motor Status Indicator
Glows green when fan speed is good, glows red when motor is stalled.
Powerful DC Brushless Fan
52 CFM free-air rating - Dual ball bearings for long life - Suitable for use in potentially explosive environments.
Less than 27dBa @ 3 feet - Virtually inaudible in most applications.

Ultra-Low Battery Drain
Uses just 0.05 watts typical when idle.

Easy Installation
Uses rubber drain couplers to attach to standard 4", 3", 2" or 1.5" I.D. PVC vent pipe

Can be installed indoors or outdoors  - No additional enclosure required.

Field-Replaceable Fan Motor
No need to buy a new complete fan...Replacing the motor is quick, easy and economical

Full 1 Year Warranty
Backed by LSL Products - Factory service, parts and technical support are just an email away!

Designed and Built in the USA

PRODUCT DESCRIPTION  FumeOut™ is designed to keep your battery box free of the fumes that are normally generated during recharging or equalization. Consisting mostly of hydrogen and oxygen, these gases can become explosive if allowed to accumulate in the battery compartment or other enclosed spaces. By drawing them outdoors, FumeOut™ performs an essential safety function.

FumeOut™  attaches to your battery compartment's 4-inch, 3-inch, 2-inch or 1.5-inch vent pipe with rubber drain couplers (included). It can also be be ordered without any couplers - Ideal for applications where the vent pipe size hasn't been determined yet. 

FumeOut™ constantly monitors your battery bank voltage, automatically turning on its fan motor whenever the battery voltage becomes high enough to cause gassing. The Controller is factory-calibrated to turn the fan on if the battery voltage exceeds 2.33 volts per cell, (i.e., 14.0 volts for a 12-volt battery bank) and to shut off the fan when the voltage drops to 2.30 volts per cell (i.e., 13.8 volts for a 12 volt bank).

A DIP switch on the controller circuit board allows these settings to be changed by the user - The turn-on voltage can be set to any value between 2.20 and 2.46 volts per cell, in 32 increments (i.e, 13.2 to 14.8 volts for a 12 volt battery bank). The turn-off voltage can be set to either 0.033, 0.066, 0.099 or 0.133 volts per cell below the turn-on setting
(i.e., 0.2 to 0.5 volts for a 12 volt bank).

FumeOut™ uses a low-voltage DC brushless fan motor - Very quiet, energy-efficient, and safe for use in potentially explosive environments. The motor itself is a high-quality, dual ball bearing design, and is user-replaceable - No need to buy another entire fan if the motor ever fails. Spare/replacement motors are available from the factory for $44.00.

Other features include:

FAN FAILURE ALARM – This safety feature sounds a built-in alarm if the fan motor stalls or fails to start.

PURGE TIMER – When enabled, this function runs the fan for 5 minutes every 24 hours to remove any fumes that might accumulate in between recharges. A DIP switch on the Controller circuit board allows it to be enabled or disabled as desired.

MULTI-VOLTAGE OPERATION – The Controller contains an efficient, switching-type voltage regulator that allows the fan motor to be operated from 12, 24 or 48 volt battery banks (maximum input is 100 DC volts). This design minimizes power consumption - regardless of battery bank voltage - and also eliminates any need to buy another fan when upgrading to a different battery bank voltage.

RUGGED CONSTRUCTION – The fan controller circuitry is housed inside a weatherproof gasketed enclosure, suitable for indoor or outdoor installation. The enclosure includes a coupler for attaching standard 1/2" non-metallic liquid-tight flexible conduit - Provides a weather-tight, code-compliant method of connecting to your batteries.

FumeOut™ is backed by a 1-year warranty, with factory service and replacement parts available.

   (Click HERE for product specifications)
   (Click HERE to download the installation and operating instructions).

*Plus $13.60 Priority Mail shipping.

**Plus $7.20 USPS shipping.

Goods provided by
LSL Products (Texas USA)
Goods sold by 2Checkout
(Ohio USA)
  Specifications  | Instructions | CHECK OUT | HOME
LSL Products
P.O. Box 681072
San Antonio, TX (God Bless Her!) 78268 USA

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