Humidifiers and Dehumidifiers - Bypass install question

I'm looking to install a humidifier, and would prefer a bypass unit. I don't have my camera handy, so I'll try to describe the layout.

The return comes down from the ceiling along the right side of the furnace. Immediately above the furnace is the evaporator. Above the coil, there's a 3-way T (front, back, and left).

So I'm left wondering where I can hook into the supply side. Do I:

(carefully) cut in at the coil?
hook in to one branch of the supply, and hope that it eventually reaches the other two floors?
branch the bypass into the multiple supply branches?
run a duct through the return to reach the "T" intersection? (No, I'm not really considering this one.)
toss the bypass, and get a blower model (installed on the return)?

Thanks for any insight!

-Jim

You can put the by pass in any of the supply duct. I would put it on the duct that you can get at with ease.

The humidity is going to be mixed in the return where the humidifier is mounted.

The humidity is going to be mixed in the return where the humidifier is mounted.

Oh, DUH!:wall: I was completely screwing up my visualization of the airflow. How I pictured air flowing from a low pressure side to a high pressure side is beyond me. Now I'm going to go crawl under a rock and hide for a bit.:o

Oh well, I guess I'd rather catch a stupid mistake up front, before anything's cut. Which just made me think of the time at the avionics company I worked at, during Christmas break, when an electrician accidentally hooked up the second rail (3 phase) to the neutral line, and sent 208V to an entire building's 110V circuits. Blew out around 100 pc's.

So there's always a worse screwup. But I still feel foolish. I need a little smiley face with a paper sack over its head.

-Jim

Now I'm going to go crawl under a rock and hide for a bit.:o
No need to hide! Our mind can be dumb at times!

Which just made me think of the time at the avionics company I worked at, during Christmas break, when an electrician accidentally hooked up the second rail (3 phase) to the neutral line, and sent 208V to an entire building's 110V circuits. Blew out around 100 pc's.
Yikes! Who's pocket book was that!?

Yikes! Who's pocket book was that!?
I never heard. They were able to fix most. I remember seeing tables stacked full of dead power supplies at the disposal store. Bought a few for their fans.

I'm guessing someone never worked there again.