Hi @R1D2  Thanks for the reply.

The number of clients will probably be less than 25 max (the whole warehouse area) and 12 to 15 daily, constant use. These will be on iPad carried for inventory control, mounted on forklift and maybe a couple of laptops doing inventory control. We are using Cisco unlimited license for max throughput on Firewall, Router and Switch.

The all metal constructed warehouse, ceiling center is about 25 (probably 22 feet) feet to the concrete flooring. There is a metall constructed wall down the center as shown in the drawing. Two very large doors between the two 'halves' of the warehouose. See the drawing for a better idea. The drawing is not to scale but generally close.

How tall is the "doughnut" shape of the signal?

I thought about dropping the EAP110-Outdoor units a few feet on 1.5" PCV pipe hung from the Girders in warehouse ceiling. I just don't want opportunity for the forklifts to bump into them. Dropping them a few feet may also reduce lightning damaged introduced via the girders. The wire cablers will be using Cat5e Grounded shielded cable. Dropping them a few feet would put them more even with the eves of the warehouse wall.  Forklift drivers will just need to be aware they are hanging there.

Here is a rough drawing of the warehouse. Wht do you think? :)

Okay, thanks... Yes these will be adjusted after the initial installation. It is understood some tweaking will need to be done.

Does anyone know how tall the said "doughnut signal" pattern is over open ground?

Welcome @DrBobTech!

You mentioned that this is a warehouse.  On each half of the building do you have tall metal racking with aisles for the forklifts -- like in Sam's Club or Costco?  Or is it more of a wide-open "shop floor" style like a machine shop or stamping operation?

The reason I ask is that the radiation pattern from the Outdoor units (like the 110 and 225-OD) is much more horizontal as R1D2 said.  Though the flatness of the donut depends on the gain of the dipole antennas used.  Generally speaking, this type of antenna / AP is much better suited for wall mounting.  Which you could do if you have a large open shop floor, but not if you have tall metal racks.

Your other option would be to use a ceiling-mounted AP like the EAP225V3 instead.  Your ceilings are perhaps a little high for these which have a downward-facing conical radiation pattern, and you would most likely need more of them (than the 6 110's you were considering).  But if you have tall metal shelving, this may be a better option for you if you can situate an AP over each aisle in between the shelves.

As R1D2 suggested, having this done professionally would be your best bet -- performance-wise -- but I understand this would be significantly more expensive than doing it yourself.  Given that you have so few clients with limited connectivity demand, I think the trial and error might be your best bet.  This way you can learn as you go and see what works best for your environment.

Both AP's the EAP225V3 and EAP225-OD are very inexpensive $60-70 on Amazon.  So you could buy a few of each and test them out.  Don't forget to plan for PoE and check the voltage requirements of the AP's versus your PoE switch.  Some of the TP-Link products use different PoE voltages.  Total cable runs need to be less than 100M in general.   But for PoE, the injector or PoE switch generally needs to be less than 50M away.

Personally, I'd use at least Cat-6 or 6A cabling these days instead of 5e.  Not sure STP is really necessary.  Unless you have a lot of fluorescent lights and electrical wiring near the data lines.

Also plan to use Omada or SDN server software or get an OC-200 for easier management and configuration.

-Jonathan