Honeywell/Enviracaire Prefilter #33002 (2 per pack) Honeywell/Enviracaire Charcoal Prefltrs #33002 (2 per pack) fits 10000(EV-1),12500(EV-25),11502,12520,13500(EV-35),13501(EV-35A),13530,13531,17400 Honeywell43300,62500