The Smartfan allows voice control via Google Assistant but you first need to enable the Skill.

Google do provide their own guide that can be found here:

Google help - Skill setup

Please follow the below steps to setup the Google Assistant skill:

Open the Google Home app on your smart phone or device
Select the Account icon at the bottom of the page to access your account

Now select Set up or add
Select Set up device
Select Link under Works with Google
In the search bar at the top of the page type "HomeWizard Cleaner"

Now select the HomeWizard Cleaner skill
Login with your HomeWizard details used when you first setup the Cleaner.

Once logged in please select "AUTHORISE" to allow Google to connect to your Cleaner,

You can now use the below commands with Google Assistant, but you may wish to rename the device before doing so.

Should you wish to rename the Cleaneryou can do this under the settings page for the Cleaner device.