Engineering controls must be established to reduce formalin exposure to the lowest possible level. In most cases, chemical fume hoods or/and ventilated grossing stations serve as the primary engineering controls to reduce formaldehyde vapors. Rooms in which formalin is used may also require special direct exhaust ventilation.
Formaldehyde should be dispensed or used in a chemical fume hood or other appropriately ventilated and approved work area.
Check your laboratory's policies and procedures to be sure you use the engineering controls provided, as well as the required personal protective equipment.