Hold the filter so that the baffle (ridge) extends vertically from top to bottom, as shown. The "height" side is parallel to the baffle from top to bottom, while the "width" side is measured from left to right.
Filter measurements are usually listed in nominal sizes, which means that measurements are rounded slightly to the nearest whole number. The precise measurement size of the filter is about 5MM smaller. If you want to replace a filter, you can first measure the filter product you currently have. The size of the baffle filter is always first expressed in terms of height. When measuring, round to the next size. Therefore, a filter with a height of 495MM and a width of 395MM is considered as a 500MM*400MM filter.
You can measure your hood and order the necessary filters based on your size and needs, or enlist the help of a professional to ensure efficiency, safety and regulatory compliance. While they are an investment and require maintenance, high-quality partition grease filters should be a top priority and should be installed as soon as possible to satisfy inspectors, comply with codes, and provide a safe and hygienic environment for your kitchen staff and customers.