The FIA have ruled that in future teams that apply for a place on the F1 grid will have to adhere to the rules governing the usage of wind tunnels.
This season Formula 1 reduced the number of hours teams can develop their cars in their wind tunnels. This was done in a bid to reduce costs.
New team Haas were believed to be exempt from the rule as they are only joining the grid in 2016.
Mercedes questioned the rules in Abu Dhabi on Saturday as Haas have a relationship with Ferrari who could have benefitted from the American team's time in the wind tunnel.
The stewards, however, have cleared Ferrari and Haas of any wrongdoing.
"Having examined the reports (including audit reports team facilities) provided to us, the Stewards confirm that there is no evidence that competitors have not complied with the requirements of Appendices 6 and 8 as they were interpreted prior to today’s date," they said.
In future, though, all new teams will have to adhere to the wind tunnel rules while the FIA added that Haas will also have to do so from today onward.
An FIA statement read: "The Stewards recommend to the FIA that in future once a potential competitor (as opposed to Official Entry) applies to be a competitor in the FIA Formula One World Championship and this application is accepted, that competitor should be bound by Appendices 6 and 8 (and for that matter any other appropriate sections of the Formula One Sporting and Technical Regulations)."
It continued: "All competitors in the 2015 FIA Formula 1 World Championship and all competitors intending to compete in the 2016 FIA Formula One World Championship, must comply with the following with effect from today's date.
"The purpose of the Aerodynamic Testing Restrictions (ATR) in Appendix 8 of the Sporting Regulations is to place limits on the amount of aerodynamic development each competitor is able to carry out. These limits are set out in Paragraph 3.6 of the Appendix.
"The detailed wording within the Appendix is also intended to ensure that no competitor is able to circumvent the purpose or intention of the restrictions by, for example, using a third party to carry out aerodynamic development on their behalf."