An incubator, comprising: a housing that at least partially encloses an internal container, wherein the internal container has an opening; a door coupled to the housing and/or the internal container and movable between a first position that allows access to the internal container from an outside position of the incubator and a second position that prevents access to the internal container from the outside position of the incubator; and a primary air flow control device coupled to the housing and/or the internal container that directs a primary air veil along or substantially parallel to a hypothetical plane covering the opening, wherein the primary air flow control device comprises a movable vane, wherein the vane is movable to at least temporarily direct air from the primary air veil into the internal container; a primary suction fan, wherein the primary suction fan is positioned to receive air from the primary air veil; a secondary air flow control device coupled to the housing and/or the internal container that directs a secondary air veil substantially parallel to the primary air veil, wherein the secondary air flow control device is configured to receive ambient air; and a secondary suction fan positioned to receive air from the secondary air veil, wherein a secondary suction fan expels the secondary air veil to the ambient air; wherein the housing, the internal container, and the primary air flow control device are positioned relative to each other to form a recirculation space that allows for recirculation of air in the primary air veil; and wherein the primary and the secondary air veils shield the opening of the internal container. a housing that at least partially encloses an internal container, wherein the internal container has an opening; a door coupled to the housing and/or the internal container and movable between a first position that allows access to the internal container from an outside position of the incubator and a second position that prevents access to the internal container from the outside position of the incubator; and a primary air flow control device coupled to the housing and/or the internal container that directs a primary air veil along or substantially parallel to a hypothetical plane covering the opening, wherein the primary air flow control device comprises a movable vane, wherein the vane is movable to at least temporarily direct air from the primary air veil into the internal container; a primary suction fan, wherein the primary suction fan is positioned to receive air from the primary air veil; a secondary air flow control device coupled to the housing and/or the internal container that directs a secondary air veil substantially parallel to the primary air veil, wherein the secondary air flow control device is configured to receive ambient air; and a secondary suction fan positioned to receive air from the secondary air veil, wherein a secondary suction fan expels the secondary air veil to the ambient air; wherein the housing, the internal container, and the primary air flow control device are positioned relative to each other to form a recirculation space that allows for recirculation of air in the primary air veil; and wherein the primary and the secondary air veils shield the opening of the internal container.