System and apparatus for air flow handling in an aircraft monument

A compartment disposed within an aircraft galley monument, the aircraft galley compartment comprising:

• an enclosure configured to house an equipment item, the enclosure comprising a rear surface, an upper wall, and opposing side walls, wherein at least one of the rear surface, upper wall, or opposing side walls includes one or more air duct connections;
• and
• a ducting assembly comprising
• a supply air duct configured to provide a supply airflow path from an external air system to the enclosure, the supply air duct including an inlet port mounted to a surface of the enclosure to provide an inlet path for air flowing from the supply air duct to the enclosure,
• a return air duct configured to provide an exit airflow path to the external air system for return air that has circulated throughout the enclosure, the return air duct including an outlet port mounted to a surface of the enclosure to provide an outlet path for the return air from the enclosure to the return air duct, and
• an airflow adjustment apparatus including an airflow adjustment surface disposed within at least one of the supply airflow path of the supply air duct and the exit airflow path of the return air duct, the airflow adjustment surface configured to cause a modification of airflow properties for air passing across or through the airflow adjustment surface,
• wherein the airflow adjustment apparatus includes a mounting surface disposed around a periphery of the air flow adjustment surface and substantially parallel to the airflow adjustment surface, wherein the mounting surface is configured to provide one or more locations for mounting the airflow adjustment apparatus to at least one air duct wall,
• wherein a shape of the airflow adjustment apparatus corresponds to a shape of an interior of the supply air duct or the return air duct such the airflow adjustment apparatus fits snugly within an interior of the supply air duct or the return air duct,
• wherein the airflow adjustment apparatus includes a mounting surface positioned substantially perpendicular to the airflow adjustment surface,
• wherein the airflow adjustment surface includes a plurality of apertures arranged in predetermined patterns across a length and width of the airflow adjustment surface such that the air flowing through the supply air duct or the return air duct flows through the plurality of apertures,
• wherein the plurality of apertures includes a first set of apertures having a first diameter and a second set of apertures having a second diameter that is larger than the first diameter,
• wherein the air flowing through the first set of apertures is configured to produce a first audible tone at a first frequency, and the air flowing through the second set of apertures is configured to produce a second audible tone at a second frequency such that a mutual frequency cancellation between the first audible tone and the second audible tone is configured to prevent a prominent audible tone at a single frequency.