Low noise, ceiling mounted indoor air scrubber

An indoor air cleaning apparatus for removing at least a portion of at least one type of gas from an indoor area of a building, the apparatus comprising:

• a cabinet including a substantially square or rectangular cross section having a height H, a width W, and a length L, the cabinet also including at least one inlet, a first outlet, and a second outlet, wherein the cabinet is configured for deployment from an elevated position within an indoor area of a building;
• a plurality of dampers for managing airflow through at least one or more of the apparatus, the first outlet and the second outlet;
• at least one sorbent bank comprising a plurality of cartridges, wherein each cartridge:
• comprises a rigid frame, at least a first and a second permeable surface, and one or more sorbent materials contained within the frame, and
• is configured to receive an airflow through the first permeable surface, over and/or through the one or more sorbent materials, and expel the airflow through the second surface;
• a fan assembly comprising a panel including at least one panel opening, at least one housing including at least one housing inlet and at least one housing outlet, at least one motor and a plurality of parallel, forward curved cylindrical impellers, wherein:
• the panel is configured to substantially cover a cross section of the cabinet perpendicular to an airflow direction of the fan assembly,
• the plurality of parallel, forward curved cylindrical impellers are arranged on a common impeller axis oriented in a direction parallel to the panel,
• the fan motor is located between two impellers,
• the at least one housing is attached to the panel such that the at least one housing outlet substantially corresponds to the at least one panel opening so as to allow an airflow exiting the plurality of impellers to flow therethrough;
• and
• the panel opening is configured to direct airflow from the at least one housing toward at least the sorbent bank;
• a heating element configured to be in one of at least two modes:
• an active mode whereby an airflow passing over the heating element is heated, and an inactive mode whereby an airflow passing over the heating element is not heated;
• and
• a controller configured to operate in at least two modes:
• an adsorption mode and a regeneration mode, and configured to control at least the plurality of dampers, the fan assembly and the heating element, wherein:
• in the adsorption mode, the plurality of impellers draw an indoor airflow from the indoor area, the indoor airflow entering the inlet of the cabinet then the inlet of the housing, whereby the indoor airflow is optionally directed over the heating element in inactive mode and into the sorbent bank such that at least a portion of at least one type of gas contained in the airflow is captured by the sorbent, the indoor airflow then exiting the cabinet via the first outlet of the cabinet,
• in the regeneration mode, the plurality of impeller draw an indoor airflow from the indoor area, the indoor airflow entering the inlet of the cabinet then the inlet of the housing, whereby the indoor airflow is directed over the heating element in active mode and thereafter the heated indoor airflow is directed to flow over the sorbent such that at least a portion of the at least one type of gas captured by the sorbent during the adsorption mode is released therefrom, then out the second outlet of the cabinet, and
• the controller controls the plurality of dampers, the fan assembly and the heating element based upon at least one of a schedule and a concentration level of the at least one type of gas in the indoor airflow.