Abstract: An aeration system for aerating particulate material disposed in a storage bin. The aeration system includes an aerator forming an elongated hollow body for being placed inside the storage bin such that a longitudinal axis thereof is oriented substantially vertical and an air supply duct connected to the aerator for providing the airflow thereto. The aerator enables an airflow therein along the longitudinal axis and provides the same to the particulate material. The aerator is made of a plurality of modular sections adapted for being stacked upon each other along the longitudinal axis. Each modular section has a bottom connecting element and a top connecting element placed at a bottom end and a top end thereof, respectively, with the top connecting element being mated with the respective bottom connecting element of an adjacent modular section. Each modular section has a conduit enabling the airflow along the longitudinal axis.

Abstract: A locking device for preventing freewheeling of an aeration fan rotor. The locking device comprises an elongated body having a predetermined length. The elongated body is adapted for being disposed through an opening of a fan housing containing the aeration fan rotor therein such that in a first position a first end portion of the elongated body is enabled to interact with the aeration fan rotor for preventing freewheeling of the aeration fan rotor and a second opposite end portion of the elongated body is placed outside the fan housing. The locking device further comprises means for holding the elongated body in the first position and a second position such that in the second position the first end portion of the elongated body is prevented from interacting with the aeration fan rotor.

Abstract: A device for supporting a bolt or pipe in a borehole. A mounting portion is adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. A first interacting portion extends from a first end of the mounting portion. The first interacting portion is adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole.

Abstract: A fan including a housing having an air inlet and an air outlet. An impeller is disposed in the housing and driven by a motor connected thereto. A connecting mechanism is disposed on the housing in proximity to the outlet. The connecting mechanism is adapted for being mated with a respective connecting structure.

Abstract: A fan including a housing having an air inlet and an air outlet. An impeller is disposed in the housing and driven by a motor connected thereto. A connecting mechanism is disposed on the housing in proximity to the outlet. The connecting mechanism is adapted for being mated with a respective connecting structure.