Pellet stove pipe vertical clearance, please help

I'm installing a pellet stove in my basement with 4" pellet stove vent. What is the vertical clearance to combustibles above the horizontal section? I would think it's greater than the 2" noted for vertical pipe?

How to Properly Vent a Pellet Stove

Thelin Co.

Clearances to Combustible Materials for Fireplaces & Stove Pipe - Rockford Chimney

Wood Pellet Outdoor Patio Heater - Non Electric, Smokeless & Portable. Perfect for Backyards & Decks (Revere Edition - 90K BTU)

The Ultimate Guide To 5 Types of Chimney Pipe: By The Pros

Imperial BM0008 Stove Pipe Elbow, 45 Deg, 6 in, Steel

Planning Your Chimney Pipe & Stove Pipe Installation - Northline Express

Clearances to Combustible Materials for Fireplaces & Stove Pipe - Rockford Chimney

vertical stove pipe Clearance question.

How to Install PelletVent Pro Chimney Systems - Northline Express

A Wood Burning or Pellet Stove Without a Chimney? Absolutely! - Home and Hearth, Wood Pellet Stoves, Fireplaces, Wood Stoves

Wood Stove & Fireplace Venting: The Complete How-To Guide