This model will hold 2 ea. group 29 batteries. It is fitted with uni-strut channel on the back side and is intended for pole mounting. It has a passive 1” Convective Hydrogen vent to safely vent any hydrogen produced during charging. Conduit access is through a 2” FPT fitting on both sides of the enclosure. Its’ insulated with 2” of Styrofoam. (R-10)