In 2013, EFA published the facilities output specification and the baseline design ventilation strategy. Together with ‘Building Bulletin 101: Ventilation of School Buildings’ (BB101) and the calculation tools ClassVent and ClassCool these documents contain the department’s guidance on ventilation, thermal comfort and indoor air quality in schools. EFA ventilation design standards are in line with the latest industry guidance from CIBSE on prevention of summertime overheating contained in its publications ‘TM52: the Limits of Thermal Comfort’ and ‘KS16: How to Manage Overheating in Buildings’. EFA plans to publish new guidelines for ventilation, thermal comfort and indoor air quality to replace BB101 with guidance based on the standards in the current facilities output specification. BB101 gives guidance on providing ventilation and avoiding overheating in school buildings and Approved Documents (AD) F and L of the Building Regulations. It also includes the ventilation performance standards required in teaching spaces. It is the document quoted in AD F as the main supporting document, and indicates how compliance with the Building Regulations may be achieved for schools. BB101 is also quoted in AD L as giving guidance on how to prevent summertime overheating in schools. ClassVent and ClassCool tools can be used at the early stages of design to help to select a ventilation strategy. ClassVent produces preliminary sizes for ventilation openings for a variety of ventilation strategies. ClassCool can be used at the early stages of design to consider ways to prevent summertime overheating. ClassVent and ClassCool are now only considered to be suitable for early design calculations and not for use in building control submissions.