Broan-NuTone LLC

A ventilation fan having a fan housing with at least one outer wall defining an interior space, the fan housing defining an inlet and an outlet. A scroll having an outer wall defines an interior space, an inlet opening into the interior space, and an outlet spaced apart from the inlet. The scroll interior space is configured to house a fan wheel having an axis of rotation and capable of moving air from the scroll inlet to the scroll outlet. The scroll outer wall has an inner peripheral wall extending about the axis of rotation at a constant radius and an outer peripheral wall extending about the axis of rotation at a growing radius according to an expansion angle.

A ventilation assembly includes a ventilation grille having acoustic bodies configured and situated to attenuate sound of the ventilation assembly. Arrangement of the acoustic bodies can form phononic crystals that can be tuned to desired sound bands and reduce sound.

A backdraft damper for a ventilation fan assembly, the backdraft damper having a main body having a wall defining an inner surface, an outer surface, a first open end and a second open end. An interior space is defined by the main body wall inner surface. A damper door is rotationally coupled to the main body wall and located within the interior space. The damper door defines a perimeter edge and the damper door is configured to rotate between (i) a closed position, in which the perimeter edge is located adjacent to the main body inner surface, and (ii) an open position in which a majority of the perimeter edge is not adjacent to the main body inner surface. A block extends from the main body wall inner surface into the interior space adjacent to the damper door perimeter edge when the damper door is in the closed position and, during operation of the fan assembly, creates an area of high pressure which creates a torque on the damper door.

An air inlet for an air handling unit includes a duct defining a passageway leading to the air handling unit. The fresh air inlet further includes an intake screen that is formed to include a plurality of openings sized to allow airflow to pass through the openings to the air handling unit. Accumulated particles are removed from surfaces of the intake screen with a screen cleaning system.

An indoor air quality system is configured to improve indoor air quality conditions within a local environment of a building. The indoor air quality system operates according to a method that includes obtaining indoor air quality levels and operating one or more appliances to adjust the indoor air quality levels.

A ventilation fan is disclosed having a housing with at least one sidewall defining an interior space, an inlet opening into the interior space, and an outlet aperture spaced apart from the inlet. The housing has at least one of a prong and a recess with at least one nail extending away from the at least one of a prong and a recess toward an aperture in the housing. The at least one of a prong and a recess is configured to be deformable to allow the at least one nail to pass through the aperture in the housing.

A ventilation assembly and methods of forming the same includes a ventilation grille having reducing acoustic bodies configured to attenuate sound of the ventilation assembly. Arrangement of the acoustic bodies can form phononic crystal to attenuate sound and can be tuned to desired sound bands to reduce sounds.

A ventilation system having a main housing configured to be positioned adjacent to a room of a building structure, a blower configured to be positioned in the main housing and draw air out of the room of the building structure, and a grille configured to be releasably secured to one of the main housing and the blower to at least partially block view of the blower. The grille has a plate defining an inner side and an opposing outer side and a plurality of legs extending from the plate and angled outwardly at an angle to the plate. The angle of the legs facilitates nested stacking of the grille with a second grille configured identically to the grille.

A ventilation system having a main housing configured to be positioned adjacent to a wall or ceiling of a room of a building structure, a blower configured to be positioned in the main housing and draw air out of the room of the building structure, and a grille configured to be releasably secured to one of the main housing and the blower to at least partially block view of the blower. The grille has a plate defining an inner side and an opposing outer side and a plurality of legs configured to be removably securable to the plate.