Is an astragal allowed

Here's the situation

We have a pair of cross-corridor fire doors (1 hour rated) where each leaf is 48" wide. The doors separate two wards of an OSHPD 1 hospital (Occupancy I-2) . We have an astragal which provides a 3/8" gap between the two doors. The rest of the gap requirements (top, bottom, side) are all met, but the question is will this astragal pose a problem due to the 3/8" gap? Is the gap limited to 1/4" or 1/8"? Is an astragal allowed? Are we required to have vision glazing in the door leafs? Where in the code is this gap between leafs addressed?
Original Post
Do you mean a center mullion?

An astragal is a device that is attached to one door leaf to cover the gap between doors that do not have a center mullion. Typically, astragals are requied for fire-rated doors since the gap needs to be sealed for compliance with NFPA 80, UL10C/NFPA 252, and UL 1784.

Usually doors with astragals will require a coordinator to ensure they close in the proper sequence (i.e. door leaf without astragal first, followed by door leaf with astragal).

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