Abstract: A residential bathtub or shower is combined with a catch drain or basin below and in proximity with the tub or shower in a unitary structure. Most components of a heat pump are located in the catch basin. A hot water tank is outside of the catch basin but located in the immediate vicinity such as at an end of the tub or above the tub or alongside of the tub. The hot tank includes a heat exchanger that is the heat pump condenser, bringing heat to the hot tank for warming household water. Hot water flows from the tank into the tub or shower for bathing and then drains into the catch basin where heat exchangers remove heat before draining or reuse in flushing a toilet.

Abstract: A battery cabinet with a plurality of spaced apart shelves of equal width and depth. Each shelf supports a removable battery module. In turn, each module has a fixed adapter that holds batteries as a battery bank where the module and adapter occupy most of the space between shelves. Battery cells are vertically or horizontally aligned with terminals joined to comb-shaped straps with blades joined to battery terminals. The space between blades allows for thermal expansion without wear on terminals.

Abstract: A modular heat recovery ventilation system includes a modular heat exchanger and a modular apparatus spaced from the heat exchanger for delivering both fresh air and exhaust air to the heat exchanger. The apparatus includes separate blowers for generating two separate air streams. The apparatus includes an access plate at the bottom thereof allowing access to the interior of the enclosure of the apparatus through a ceiling.

Abstract: Damper apparatus includes a housing and dividers in the interior of the housing. One of the dividers forms a plenum and two openings leading from the plenum to an air flow outlet of the housing. Separate damper blades control air flow through the openings. A second divider divides the housing interior into separate passageways, one passageway in communication with one opening and the other passageway in communication with the other opening.