Further to its press release dated February 17, 2026, Zentek Ltd. (TSXV:ZEN) (NASDAQ:ZTEK) ("Zentek" or the "Company") is pleased to announce that it has received a revised classification by Health Canada's Pesticides Regulatory Directorate ("PRD") that ZenGUARD™ Enhanced Air Filters are not subject to regulation under the Pest Control Products Act. The product is exempt under section 3(1)(a) of the Pest Control Products Regulations on the basis that it operates through a mechanical mode of action. The classification resolves the regulatory matter most recently disclosed in the Company's press release and Management's Discussion and Analysis dated February 17, 2026. The classification is conditional, and any change to the design, use instruction, or marketing of the product could result in a re-assessment by Health Canada.

Based on the classification by Health Canada, Zentek is now accepting commercial orders for ZenGUARD™ Enhanced Air Filters in Canada and is seeking to advance additional commercialization pathways, including licensing and the sale of ZenGUARD™-enhanced filter media to participants in the heating, ventilation, and air conditioning ("HVAC") supply chain. ZenGUARD™ is the subject of an issued Canadian patent (granted 2022; term to 2041) covering its application to personal protective equipment and HVAC applications.