probably not. i assume you're referring to a food allergy to coconut. the food part of the coconut is of course the white fleshy part of the fruit. the filters you refer to are made from the fibrous outer shell of the coconut. because you will not be ingesting (eating) this you probably won't feel any ill effects from breathing air filtered through coconut fiber. you also probably won't notice any effects from drinking water filtered through this fiber. however if you suffer an anaphylactic reaction to coconut then i would not advise drinking water filtered through coconut fiber. while i believe it's unlikely you'd have an adverse reaction you don't want to take that chance. for more accurate information consult an allergist. that's your best bet! hope this helps.
if i am allergic to coconut will i react to air or water filters made from coconut shell based activated charcoal?