Warning – GTO UL325 SERIES User Manual
Page 2
 
Warning!
The Mighty Mule® Gate Opener is intended for use with vehicular swing gates. The opener can be
used in Class I, Class II, Class III and Class IV.
Vehicular Gate Opener Class Categories
This equipment is similar to other gate or door 
equipment and meets or exceeds Underwriters 
Laboratory Standard 325 (UL 325). However, gate 
equipment has hazards associated with its use and 
therefore by installing this product the installer 
and user accept full responsibility for following 
and noting the installation and safety instructions. 
Failure to follow installation and safety instructions 
can result in hazards developing due to improper 
assembly. You agree to properly install this product 
and that if you fail to do so GTO, Inc. shall in 
no event be liable for direct, indirect, incidental, 
special or consequential damages or loss of profits 
whether based in contract tort or any other legal 
theory during the course of the warranty or at 
any time thereafter. The installer and/or user 
agree to assume responsibility for all liability and 
use of this product releasing GTO, Inc. from any 
and all liability. If you are not in agreement with 
this disclaimer or do not feel capable of properly 
following all installation and safety instructions you 
may return this product for full replacement value.
READ ALL INSTRUCTIONS CAREFULLY AND 
COMPLETELY before attempting to install and 
use this automatic gate opener. This gate opener 
produces a high level of force. Stay clear of the 
unit while it is operating and exercise caution at all 
times.
All automatic gate openers are intended for use on 
vehicular gates only.
Residential Vehicular Gate Opener-Class I: 
A vehicular gate opener (or system) intended for 
use in a home of one-to-four single family dwelling, 
or a garage or parking area associated therewith.
Commercial/General Access Vehicular Gate 
Opener-Class II: A vehicular gate opener (or 
system) intended for use in a commercial location 
or building such as a multifamily housing unit (five 
or more single family units), hotel, garages, retail 
store, or other building servicing the general public.
Industrial/Limited Access Vehicular Gate 
Opener–Class III: A vehicular gate opener (or 
system) intended for use in an industrial location or 
building such as a factory or loading dock area or 
other locations not intended to service the general 
public.
Restricted Access Vehicular Gate Opener– 
Class IV: A vehicular gate opener (or system) 
intended for use in a guarded industrial location or 
building such as an airport security area or other 
restricted access locations not servicing the general 
public, in which unauthorized access is prevented 
via supervision by security personnel.