I helped my brother install a Valcourt Cartier FP14 in his new house, and immediately noticed a lot of wind noise and howling it got worse this weekend with more winds here. The fireplace has 21' of selkirk 6" Supervent chimney pipe and the deluxe rain cap with spark arrestor. Fireplace dose not hav an OAK hooked up. Anyone know if a wind cap would help or any other suggestions.