Wouldn't be overkill buddy it will stop any unwanted old basement smells getting in the tent. And it will also stop a hellova lot of dust and debris getting in too. Bad or strong house odours can through time cling to your bud imho , my cousin used to have damp in his home and his bud always tasted like the house smelt.
Deodorants too , I grow in a basement I don't need filtered intake but I'm adding one this time because it sucks the air from upstairs right down to the basement and when my nephew spray's lynx after a shower or something as simple as cooks food I smell it where the tents located.
weve probably all smoked weed that you thought mustov been grown in your mates aunties underwear drawer lol coz it tastes like perfume or arse so my advice is it's a great idea pal ,add your filter and save disappointment if there's unwanted smells where you grow.