Need compact humidifier advice

[hvacmd]

I have a 100 unit condominium association with fairly ancient GE air handlers using electric heat , many of whose owners would like to add humidity.Thos units which have humidifiers are being served by Singer bypass units.The maximum available depth cannot exceed 9 inches without major (return air box,or closet door )modification.The old Aprilaire 550 would barely fit at exactly nine inches of depth.Any larger ie: 9.25 will not fit.Do I have any other options other than steam generation or spray nozzle units.?

[tedkidd]

Air seal the buildings.

Humidity is like bailing water INTO a leaky boat on a trailer. If you seal the shiplaps, rain will keep water in the boat for you.

Occupants generate humidity from activities of daily living. Unfortunately the moisture quickly leaks out. Slow the leaks.

You'll sell a MUCH bigger job and You'll save them a bunch of energy money in the process.

[codgy]

remote mount steam best option. Just watch out for water issues from drain.

[hvacmd]

A Generalaire bypass unit was exactly nine inches deep and worked fine.Regarding the remote steam units,I have had a 50% failure rate with the low capacity Honeywell (based on 16 installed)and now have switched over to the Aprilaire version,