N.Y.C. Admin. Code § 27-512: § 27-512 Fire protection.

The ground enclosed by a tent or air-supported structure, and the ground for a distance of at least ten feet. outside of same, shall be cleared and maintained clear of all combustible material or vegetation. No open flame of any kind shall be employed within the structure, or closer than twenty feet to any part of the enclosure fabric. Fire extinguishing facilities shall be provided in accordance with the requirements of chapter four of this title.