N.Y. Comp. Codes R. & Regs. tit. 8, § 108.2
(a) For one-teacher school classroom or other small room, used for assembly purposes, the following sizes are recommended:
(b) For auditorium or large assembly hall, the following sizes are suggested:
(3) 4 feet by 6 feet on 9-foot standard.
(c)
(1) The flag proportions shall be as follows:
Hoist (width) of flag 1.0
Fly (length) of flag 1.9
Hoist (width) of union 7/13
Fly (length) of union 0.76
Width of each stripe 1/13
(2) For schools that wish to provide flags of such proportion as the foregoing, the following sizes are recommended:
The flag for use in school assembly rooms should be of silk; and of such proportion and size as to command attention and respect.