Answer:
Noun
Explanation:
An infinitive phrase is defined as the infinitive form of a verb which includes any type of complements & modifiers.
So in this question, the infinitive phrase would be "to find shelter".
The infinite phrase here is used as an object due to the fact that it is governed by the verb "ran".
Now in literature, an object is defined as a noun/pronoun that is governed by a verb or even a preposition.
Thus the infinitive phrase is a noun.
