Does the underground garage fan room property have the right to use it?

I don't know if the use you mentioned has changed the purpose, if so, it is not allowed.

Article 63 of the Regulations on Property Management

In violation of the provisions of this Ordinance, without the consent of the owners' meeting, the realty service enterprise arbitrarily changes the use of the property management house, and the real estate administrative department of the local people's government at or above the county level shall order it to make corrections within a time limit, give it a warning and impose a fine of 6,543.8+0,000 yuan or more and 6,543.8+0,000 yuan or less; If there is income, the income will be used for the maintenance and conservation of parts, facilities and equipment used in the property management area, and the rest will be used according to the decision of the owners' meeting.