Honeywell IAQ and Zone Board Dehumidify by Slowing Blower

[GWB]

I have a Lennox variable speed blower and Lennox III Harmony Zone board (2 zones). I am having a installer install 2 Honeywell IAQ Vision Pro 9421 Thermostats (with module). Does anyone know if the zone board and the IAQ are compatable to control the slowdown of the variable speed blower for dehumidification? My installer indicates it is possible if not zoned but not sure if zoned.

[t527ed]

won't work with a zone panel, iaq's are a waste of money with harmony 111 unless you are using them to control a humidifier.

zone panel is set up at install to deliver cfm's needed according to what zones are calling.