Air sanitizer

An air sanitizer comprising:

• a housing with an air inlet and an air outlet;
• substrates coated with a photo-catalytic coating for cleaning air which comes into contact with surfaces of the photo-catalytic coating, and
• a light source comprising LEDs arranged to emit light to be incident on said surfaces to activate the photo-catalytic coating,
• wherein the air sanitizer has a substantially rectangular box shape, with a depth dimension which is less than a width dimension, and the width dimension is less than a length dimension, and the LEDs are mounted to emit across the width dimension and the substrates are mounted for air flow through the depth dimension;
• and wherein the air sanitizer comprises mounting fixtures for mounting to a cooler with a fan,
• wherein:
• the substrates are arranged as at least one grille,
• there is an upstream grille and a downstream grille in a direction of air flow;
• and
• the LEDs are mounted between said upstream and downstream grilles to emit light across an air flow direction to include the upstream and downstream grilles in the LED fields of emission,
• the LEDs are arranged to emit light which is directly incident on some of said surfaces of the photo-catalytic coating, and indirectly incident by way of reflection on other surfaces of the photo-catalytic coating,
• the surfaces on the substrates are substantially orthogonal to an optical axis of the light source, and are spaced from said optical axis so that diverging light is directly incident on at least some of the surfaces and at least some reflect to be incident on other substrate surfaces;
• and
• the light emission from the LEDs is at an acute angle to orthogonal to an air flow path between the substrates.

A cabinet or display case comprising a housing for supporting shelves for placement of products, a cooler with a fan for circulating air and delivering cooled air around said products, and an air sanitizer mounted in an air path to or from the cooler, wherein said air sanitizer comprises:

• a housing with an air inlet and an air outlet;
• substrates coated with a photo-catalytic coating for cleaning air which comes into contact with surfaces of the photo-catalytic coating, and
• a light source comprising LEDs arranged to emit light to be incident on said surfaces to activate the photo-catalytic coating,
• wherein the air sanitizer has a substantially rectangular box shape, with a depth dimension which is less than a width dimension, and the width dimension is less than a length dimension, and the LEDs are mounted to emit across the width dimension and the substrates are mounted for air flow through the depth dimension;
• and wherein the air sanitizer comprises mounting fixtures for mounting to the cooler with the fan,
• wherein:
• the substrates are arranged as at least one grille,
• there is an upstream grille and a downstream grille in a direction of air flow;
• and
• the LEDs are mounted between said upstream and downstream grilles to emit light across an air flow direction to include the upstream and downstream grilles in the LED fields of emission,
• the LEDs are arranged to emit light which is directly incident on some of said surfaces of the photo-catalytic coating, and indirectly incident by way of reflection on other surfaces of the photo-catalytic coating,
• the surfaces on the substrates are substantially orthogonal to an optical axis of the light source, and are spaced from said optical axis so that diverging light is directly incident on at least some of the surfaces and at least some reflect to be incident on other substrate surfaces;
• and
• the light emission from the LEDs is at an acute angle to orthogonal to an air flow path between the substrates.