"These items were not distributed to provinces and territories for frontline health care response, and are being subsequently assessed for use in non-healthcare settings," he said.
Chinese model KN95 masks are similar to N95 masks, as well as the FFP2 model used in Europe.
"Much of the world's supply is manufactured in China and moving materials out of that country is highly complex," said Public Services and Procurement Minister Anita Anand.
The relationship between Ottawa and Beijing has been on the rocks ever since the arrest of Meng Wanzhou, an executive at Chinese telecoms giant Huawei, in December 2018 in Vancouver.
Millions of other respirators and N95 masks are currently being scrutinized by the agency, Anand said.
Meanwhile domestic production of masks and other medical supplies "is ramping up," with contracts signed with three more Canadian companies this week to produce 16 million "medical face shields."
General Motors said in a statement it would start producing one million masks per month for the Canadian government at its Oshawa assembly plant, which had been shuttered in December 2019.