Yes, but note that all nouns take a h after the word 'sa', whether they are masculine or feminine. The rule that feminine (but not masculine) nouns take a h after the definite article applies only to the nominative/accusative case--that is, the subject or the direct object of the verb.
Nouns that follow a preposition or preposition+article (such as 'sa') are normally in the dative case. The rules for initial mutation in the dative depend on which preposition is being used (eg. 'sa' takes an 'h', 'i' takes an urú, 'ag an' takes an urú, 'den' takes an 'h' etc.) but the gender of the noun has no effect at all in the dative--masculine and feminine nouns both follow the same rules.
san is the form of sa used before a vowel. Similarly, without an article, you use i(n), adding the "n" before a vowel:
i gcuisneoir: in a fridge
in Éirinn: in Ireland
sa chuisneoir: in the fridge
san oíche: in the night
sna Gardaí: in the police force
All the gory details here: http://www.nualeargais.ie/gnag/i.htm
You'll run into this a lot more with other prepositions. "Ta/ ochras orm." = "I'm hungry." Literally, "Hunger is on me." You wear emotions in Irish, so, "Ta/ bro/n orm." = "I'm sorry" because it literally says, "Sorrow is on me." Ta/ isn't exactly "is." It's literally "stands." But "Is" as in "Is cat me/" (I'm a cat.) is the "is the same thing as" kind of "is." Ta/ is the "stands as" kind of "is." (Sorry I've had to put the accent marks after the vowel above, hope you catch my meaning.)
Tá = is. Because Irish doesn't have a verb for "to have," they express the idea by saying "(possessed thing) is at (possessor)."
So, for example, if I wanted to say "I have a dog" in Irish, I would say "Tá madra agam." Which literally means "A dog is at me" (Tá = is, madra = a dog, agam = at me).
'Cuisneoir' takes a 'h' here for a different reason. The feminine-h/masculine-no-h rule for the definite article applies only to the nominative/accusative case--ie. the subject or direct object of the verb.
When a noun follows a preposition or preposition+noun it is in the dative rather than the accusative/nominative. Nouns in the dative case mutate according to the rule for the particular preposition used regardless of the gender of the noun. In this case the preposition is 'sa' (which happens to represent a contraction of 'i + an'). The preposition 'sa' causes lenitition in the following noun irrespective of whether it is masculine or feminine.
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There is also a man in the fridge. Here ducks read newspapers, deer drink milk, bears swim towards us, lions eat clothes, Pól is an international man that is also a police officer, the Irish Prime Minister, the President of Ireland and assorted other characters. 'We're all mad here...'