Abstract: An air filter includes a filter frame, a filter cloth, a plurality of wires, and one or more pulling elements directly attached to a surface of the filter frame. The air filter is characterized by an installed condition in which a majority portion of the air filter is disposed in a housing and an uninstalled condition in which another majority portion of the air filter is out of the housing. The one or more pulling elements facilitate a user's pulling the air filter out of the housing. The one or more pulling elements comprises a flap, a recess region, a thread, a split pin type pulling element, a patch, a loop, a letter L-shape dual hook tool, and a tool with a self lock tool. An other air filter is wider than a housing. A first member of a filter frame of the other air filter serves as a handle for a user to pull.

Abstract: The present invention is regarding electrical ceiling outlet box and mounting bracket. The mounting bracket will not be placed below the ceiling box as people usually do currently. Instead, it will be placed in the ceiling box, on the top of two mounting elements (ears). Thus installer can hang the mounting bracket and attached light feature or ceiling fan on, have two hands for the installation.

Abstract: The present invention is regarding electrical ceiling outlet box and mounting bracket. The mounting bracket will not be placed below the ceiling box as people usually do currently. Instead, it will be placed in the ceiling box, on the top of two mounting elements (ears). Thus installer can hang the mounting bracket and attached light feature or ceiling fan on, have two hands for the installation.

Abstract: An air filter includes a filter frame, a filter cloth, a plurality of wires, and one or more pulling elements directly attached to a surface of the filter frame. The air filter is characterized by an installed condition in which a majority portion of the air filter is disposed in a housing and an uninstalled condition in which another majority portion of the air filter is out of the housing. The one or more pulling elements facilitate a user's pulling the air filter out of the housing. The one or more pulling elements comprises a flap, a recess region, a thread, a split pin type pulling element, a patch, a loop, a letter L-shape dual hook tool, and a tool with a self lock tool. An other air filter is wider than a housing. A first member of a filter frame of the other air filter serves as a handle for a user to pull.

Abstract: A battery cell includes a generally battery cell and removable elements which providing a function for battery users to mark the battery status of used or dead.

Abstract: A ceiling box has one or more than one additional hanging element so electricians could hang up light features or ceiling fans on it to free their hands for connecting wires.