Heat on Floor setting
 

Can anyone check their air flow when on floor setting! Do you get air output from the side vents that blow onto the window and slight air from the windshield vents?

Yes.
I noticed on floor heat basically the flow is split 50/50 with the defrost regardless.
Its not impressive.

Thank You not sure why it is that way when you can choose feet and windshield.

Easy, it is there to keep the side windows clear. There is always a small amount of air going to the side windows. Lots of moisture in your exhaled breath to fog them up pretty fast if you have a few people in the truck.

yep, normal.

When FLOOR mode is selected:

• the recirculated air request button is enabled. If the recirculated air request button is selected (indicator on), the air inlet door closes, preventing outside air from entering the passenger compartment. If the recirculated air request button is not selected (indicator off), the air inlet door opens, allowing only outside air into the passenger compartment.
• the air distribution doors operate simultaneously to direct airflow to the floor duct. A small amount of airflow from the defroster duct and side window demisters is present.
• blended air temperature is available. Only when A/C (air conditioning) compressor operation has been selected by pressing the A/C (air conditioning) button (indicator on) can the airflow temperature be cooled below the outside air temperature.
• the blower motor is on and the speed is adjustable.

If it wasn't set up the way it is, you'd have to deal with 33 or 50% air flow to the windshield any time you need to clear it (whatever the distribution is set at). During cold weather, having hot, dry air hitting me in the face is annoying. This is especially notable when accompanied by my wife, who can't ever be comfortable if she doesn't have 195ºF air blowing on her feet at gale force. After defrosting the windshield, I can shut off the face-furnace-blast, and the system keeps the windshield clear without having to put it on face-furnace-blast again.

I don't have to constantly adjust the settings to clear the windshield repeatedly. Many of us are too young to remember vehicles that could completely shut down the windshield vents. There would always be cold air rolling down off the windshield and side windows, and they would fog frequently. You'd fiddle and fiddle with the controls until you got just enough air to keep the window clear, but not enough to be annoying. Air distribution was generally horrible, and if the flow wasn't annoying you, the windows would fog back up shortly.

Since then, they've figured out how much air flow will keep the windows clear, and how to direct it to keep it from annoying drivers, in 99% of environmental conditions. It's amazing how well things like this are handled now, almost in a behind-the-scenes, you-don't-have-to-think-about-it manner.

Nearly every car made these days functions the way that is being questioned in the thread.

The air is blowing at the window and a slight amount at the windshield to combat condensation that normally occurs in cold weather when the floor setting is typically used. Ie: Humans breathe and add moisture to the air inside the car. Heat it up and the air can hold more moisture, and it condenses on the cold window surfaces. The air moving across them prevents this from happening.

Quite frankly, this generation of F150 does a better job at this than any other vehicle I've owned - including previous generations of F150. It was interesting in some of our cold snaps to observe other cars and the condensation on their side windows. GM trucks in particular did not appear to be able to keep the side windows clear.