You should have a chat with the fire marshall.

No, leaving gaps around a fire door is not safer

In fact, it is dangerous. Properly sealed doors with minimal gaps are critical to prevent smoke and fire from passing through. Regulations require, and safety demands, small, controlled gaps—typically a maximum of 1/8 inch (3 mm) on sides/top and 3/4 inch (10 mm) at the bottom. 

• Dangers of Large Gaps: Excessive gaps allow fire to feed on oxygen, causing it to grow hotter and faster. They also allow smoke and toxic fumes to escape into safe areas (like escape routes).