How close the door remains to the wall when its open? Can insects and pests enter through the sides when closed?

Yes the door is about an inch away from the wall when closed

I have a 4 inch space from my ceiling to the top of the doorway. What's the measurement from the top of the hanger to the bottom of the wheel?

I don't happen to have the dimensions available with me at this time but I can tell you if you only have 4 inches from the top of the door opening to the ceiling, you will probably not be able to use any barn door hardware. The rail that the rollers sit own needs to be mounted above the door opening as well as the space for the rollers. You also need about 1/4 to 1/2 inch from the bottom of the rail to the top of the door itself. All of that will add up to more than 4". This is a great question as most novice installers won't even think about this when purchasing barn door hardware. I commend you for the forethought of the installation prior to purchase.

Can you mount the rail directly to the drywall / studs? Or do you have to install a header board first?

You can mount directly to the studs. However, you are likely to need to drill at least some new holes in the rail to place it where you want. Strangely, the unit I installed had pre-drilled holes on 17" centers (what?????). I used black electrical tape on the back of the rail so the wall color did not show through the pre-drilled holes that were not used. If your framing is already exposed it might be worth installing some 2x6 blocking, but if not you can drill your own holes where you need them. The hassle to value ratio of the rock repair is not worth it IMHO. Good luck with your project.

what is the diameter of the wheel itself? I'm looking for something small, with a wheel maybe 1'' to 1.5'' in diameter to fit a smaller mounting space

The diameter of the [2] upper wheels is apromx. 2 3/4" in diameter. You could find (2) wheels the size you need and use them instead of provided ones. They attach by (1) bolt through the center. The wheel inside " rim" that rides on the 3/16" thick bar should be at least 1/4" deep. Hope that helps

Manufacturer	U-MAX
Part number	FBA_BASIC-J-6
Item Weight	6.35 Kilograms
Product Dimensions	102.87 x 10.92 x 6.1 cm; 6.35 kg
Item model number	FBA_BASIC-J-6
Color	Black
Material	Alloy Steel
Item Package Quantity	1
Number of Handles	2
Batteries Included?	No
Batteries Required?	No

U-MAX 6.6 FT Heavy Duty Sturdy Sliding Barn Door Hardware Kit • Super Smoothly and Quietly Wheel• Includes Easy Step-By-Step Installation Instruction

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